@J.Vizuete Took me a bit, sorry! I usually try to read a whole thread before commenting, which I haven’t had a chance to do in this case. So forgive me if I’m repetitive. And for some generalizations. And typos.
The basic answer for me is that I’m not worried about my tastes changing, leaving me with a cellar full of wine I don’t like anymore. I allow for the possibility it might happen, but my level of concern is pretty low. I’m also pretty confident I’m going to want to be married to Jonathan for the duration, though I know there’s a possibility my tastes could change. 
My level of confidence versus concern has to do with my own process over the years and what I’ve observed in others. First, to repeat a caveat I’ve always included when lauding case purchases: I don’t think anyone should start by buying only in quantities. I don’t think anyone needs to end up this way, either, but I really don’t think it’s a good way to begin for most people. Absolutely some time spent exploring is important. And tastes will change, for many or most of us. But I don’t think that needs to heavily influence how you buy, once you’ve established parameters of preference.
A bit on my own journey – my tastes have certainly evolved. When I started seriously “collecting” wine (quotes because it began as a few bottles huddled in a closet hoping something great might happen), I got excited by what I read about cult cabernets from CA and, later, some those early ooze monsters from Australia. I owned 01 Integrity at one point! But after a few years of exploration, I moved away from that style, and started on the inexorable journey to, well, where I am now. I drank, sold, or gave away the remaining bottles of wine from my earlier days that I no longer enjoyed. Granted, I didn’t have ton of them, but I felt very confident that I wasn’t going to go back. They didn’t go well with food (more on that below) and they made my palate very tired, which wasn’t fun for me.
So I do know about tastes changing, and it is very common. The question I would ask is two-fold: at what point in your development has the change happened? And how have your tastes changed? Some changes, to me, are more likely just fancy or current crush on something, which I think might be passing, while others are true palate evolution. If your tastes are changing after a good deal of exploration and development, I think that’s more ikely to be permanent, or close to it. Also, while tastes can evolve in any direction, I think it’s more likely that true evolution will be away from high alcohol, highly extracted wine rather than towards it.
For me, the last 15 years, at least, my focus has been on high acid, moderate alcohol wines that are extremely food friendly. I have a lot of Riesling, champagne, nebbiolo, Loire whites, and red and white burgs, plus a smattering of mature, classically styled Bordeaux, Rhones, Tuscans, Loire reds, and old CA cabernets. These wines go with the food I eat, which is for me a driving force behind how I think about, buy and drink wine. I think these kinds of wines are objectively more food friendly than some others – not trying to tell people who to eat and drink together, just stating my strong opinion about food friendly wines. I don’t expect I’ll start eating differently, so I’m pretty comfortable with the idea that, as long as I want wine, I will want these kinds of wine. Within this incredibly broad stylistic category, I have a lot of variety and choice. Of course, it’s always possible that I’ll suddenly think 07 CdP is a great match with sushi. But I doubt it.
I buy age worthy wines in general, which helps me be comfortable with ebbs and flows within my cellar. We might forget about chenin for months at a time. Or go a year without pulling a Rhone. I’ve gone through periods where sangiovese doesn’t do it for me at all. Have gotten into a rut where we’re only drinking Riesling, champagne and red burgundy. I’m not worried about what’s sitting downstairs – it’s going to be fine for longer than I’m likely to ignore it.
Part of this lack of concern probably has to do with my emotional and mental landscape. I am not inclined to let fear of what might happen have undue influence on my choices and hobbies. For instance, when I got into cycling, I started with a very modest bike, rode it a lot, got a better one. Rode that one a lot. When I bought a MUCH better bike, and invested in some upgrades and gear, I had fleeting thoughts about “what if I get bored of cycling?” But I didn’t let that stop me. As it happens, I did move away from cycling. I now live somewhere it isn’t as easy, and it just doesn’t thrill me as much as it used to. I ride a lot less. I even skipped last season entirely. I feel a little guilty about having spent all that money on equipment that’s now just sitting there most of the time, but mostly I remember how much more enjoyable my time with the great bike was than it would have been if I’d decided not to invest, because I feared not sticking with it. Not a perfect analogy, I know.
As I’ve said before, I’m more worried about running out of things I love than I am about dying with too much wine. The same could be said for my tastes changing. I am pretty confident that some of all of my cellar is going to make me happy for the rest of my wine drinking life. If part of it doesn’t, that’s okay. I can sell it, give it away, or just know that I got a lot of pleasure from buying it and having it as an option.