I say the market would be infinitesimally small.
It certainly has to be at the price of the cans today. You can look in the reviews and see people who supposedly bought the things but I just have my doubts that it's worth it to anyone.
If you're surprised by that, start observing how much fancy stainless homebrewers buy, just because it's cool. Lots of folks get a kick out of emulating craft breweries.
Guilty as charged, I have a few pieces of nice stainless steel kit. But I only bought it once and I don't hand it out to people every time I give them a beer. And if I did hand it out to people, they don't throw it away after they drink the beer. What we're talking about here is one massive recurring cost.
We all scratch our heads at what somebody else might do for recreation and what they might spend, and sometimes we see stuff where we think people truly are out of their mind. I'm not here to say what somebody else should or should not buy. I own a business and I look at this from a strictly business standpoint and I think, who would buy these things? The consumables cost is unbelievable. I can't believe there's even an entry point into the market, and yet they have the things in stock to sell. My back of the napkin math tells me that I would add about $50 to every 5 gallon batch of beer I make in order to package it this way. And that's if I'm really generous and I just completely ignore the cost of the machine.
Home Brewers for the most part are cost-conscious. Clearly some are not. Don't confuse that with me saying people are cheap, but generally speaking from what I've seen, people like to get some value for their money. That doesn't mean they won't spend some money, it just means they prefer to not throw it away. And they might even throw some away once in awhile, but they don't want to throw it away all the time. If we're going to have these disposable containers, how about something more akin to a Hawaiian Punch drink box. LOL
I have wondered why no one's invented reusable cans yet.
Or fully opaque PET bottles.
Or aluminum bottles.
I mean if someone could sell me 4 dozen swing-top metal 50cl bottles, I'd be just about set for life. The durability and opacity of metal with the reusability of bottles. 🤷♂️
being serious here, for the price of what they're charging for these cans, you could take a couple iterations of that cost and do resealable stainless steel containers. And if they would make the can tall enough, you could cut the top off of it and clean it out and then use it again. LOL Take a look at the price of the things, we're talking about a buck and a half per can in some cases. Even at a dollar a can if we consider a 5 gallon batch, I'm adding $50 to that batch of beer so I can give it away or transport it. With all due respect, I can buy a hell of a good case of beer for 50 bucks. I consider myself to be one of the people who really enjoys my home brewing, and if you were to ask me what are the least favorite things I have about this, I would say cleaning kegs and packaging beer, in that order. So packaging beer doesn't ride high on my list of reasons I homebrew.