I think there is a lot of demand for something like this.
But I think there is plenty of evidence for some skepticism. 95% compatibility with games is a requirement we all can agree on. Do that, and I'd be in.
I have a modded Flashback 2, and I think it's really cool. But there are problems with a lot of games. That makes it more of a "niche" product and not my go-to Atari 2600 as it should have been. Will this 3200 use a "real" TIA, or this new re-created one (from the FB2) that has issues? Same for MARIA (and 7800 compatibility). The 7800 library is so small that any compatibility issues would be a killer IMO.
I see no reason to put down money up-front without more information at least.