I agree with David.
You should visit your friend now if you want to “help” him drink it. 
I really stand by the vacu vin air pumps (these are what YLee mentioned). Especially in the fridge, the colder the temp, the longer a bottle will last. I’m not sure it would last until fall. But a young wine like that should be pretty good for a few weeks at least. They can be ordered on amazon easily.
With that in mind, I have friends who freeze wine like this. Even older red wines. I can’t speak to that but maybe someone else can.
Pour it into a smaller vessel all the way to the top. Will last for months.
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I am strong believer of different sized bottles. I actually have 500 ml, 375 ml, 250 ml and 125ml bottles which I have used to store opened wine. Just fill (I actually slightly overfill) to the absolute top, close and store in the fridge. Lasts for 3 months with little change.
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Hmm thought I mentioned he was leaving town early the following morning…
You did, though not in your initial request for suggestions. I fail the test as I focused on the original question and missed the update.
Given the facts we now know - it is open; he will not drink it; and he has no time to do anything but cork it and hope then I suppose that is what I recommend.
AITA?
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Freeze it. Or pop the cork back in and Coravin argon it.
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I have some smaller 3-4oz screw top glass jars that I’ll put wine in if I want a friend to taste or something but know its gonna be a few days before they get to it. have had dry reds and whites last 2 weeks in them and still be going strong, which tells me a Muller GKA is gonna probably have no problem going a month or two in one. the trick is fill it all the way up so theres no air/o2 and screw the lid on tight, then fridge it. works like a charm
Does everyone’s gkas die that quickly? For my palate, they improve for weeks after opened.
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It will most certainly improve for months in the fridge
I belatedly realized I had made the mistake of giving advice without asking the key question:
How was it showing?
Don’t know
FWIW, earlier this week @Robert_Dentice poured a stunningly fresh 97 Willi Schaefer GD kabi and later revealed to all of us it had been sitting open in his wine fridge for three weeks.
I would go with the above suggestion of freezing it. Probably has the highest chance of preserving it as is.
There is a crazy spectrum of responses here. Kind of amusing.
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I’ve certainly learned there is no consensus here. Pump it, cork it, Drink it, transfer it, freeze it, Coravin it.
Although I did make a suggestion, I admitted I was just guessing and have no idea. As such, I have no horse in this race and can be objective in judging which method(s) worked, and to what to degree. Thus, I volunteer to judge the results if someone will only be so kind as to take 6 bottles of 2015 EM auction GKA and pump, cork, drink, transfer, freeze, and coravin one of each until my birthday, which is right around the first day of Fall.
TYVM in advance.
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Now that’s a blind tasting I can get behind.
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Now we have a Daft Punk song!
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Onboard, but I was singing it to Devo…
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