I think Mel and Tom got it.
If you remember in the 1970s, when the “businessman’s lunch” lost popularity and women really started entering the workplace in full force, there were all kinds of etiquette issues and books were even written about how to talk to women if you were a man and how to talk to men if you were a woman. There were even newspaper columns and people who wrote about how to dress for the workplace. Women were supposed to wear those big stupid shoulder pads because the image of physical power was supposed to be good for their careers, etc.
Anyhow, that’s when the wine fad started in the US and there were all kinds of fern bars opening that served as places where women and men could go after leaving the office. And while guys still were drinking martinis or liquor, women wanted something else. Along comes Chardonnay, which was usually made with a little bit of RS left and a little bit of vanilla - Kendal-Jackson Reserve Chardonnay set the standard, and suddenly women had their own drink.
And it has the most beautiful name of any wine grape. People could pronounce it and sound sophisticated at the same time. That probably has as much to do with it’s popularity as anything else, and I think it also accounts for the popularity of Merlot. If you’re going to drink a varietal wine, you want to be able to pronounce it.
As to it’s being popular because it’s so widely planted, that actually puts the argument in reverse order. It wouldn’t be widely planted if it weren’t popular.
On its own, it’s a fairly insipid grape, but it can be goosed a little by stirring lees, oaking, etc., and so it can produce wine in a wonderful variety of styles. That makes it interesting to some of us, but that’s not why it’s popular. The popular model is still the KJ model - they sell oceans of the stuff and it made Jess Jackson the wealthiest man in Napa, at least insofar as people who made their money from the wine business.
If you put other grapes into people’s hands, they often like them and will buy them. I’d put a glass of Muscat or Torrontes into the hands of customers and they’d most often buy it. Usually for the floral aroma. Guys would buy it because they’d think their girlfriends/wives would like it and women often picked it up because it smelled and tasted good. I suppose that if we were starting out today, one of those grapes would have become more popular and we wouldn’t have the Chardonnay we do, but that wasn’t the case in the 1970s and 1980s when Chardonnay established itself.
I don’t think its popularity has anything at all to do with Burgundy. The only connection would be that in the 1970s when the wine business was taking off in the US, winemakers and drinkers looked to France for all things sophisticated and good about food and wine. Today they’d probably look to Italy but it’s too late.