I think in general, classic gaming is stagnant. younger gamers see simplistic games with pixel graphics as something that belongs on a 99 cent iphone game and not a console, and fewer new developers are willing to risk new retro style games.
On the other end, we - the classic gaming crowd - will continue to get older and become less and less relevant to marketers who will continue to push the latest war fps onto the 13-15 year olds who will increasingly replace us as the dominant market.
Prices are in a boom phase, but the bubble will burst someday - maybe not for decades, but I think there will come a time when collections of any physical media will become almost worthless.
Does anyone expect a kid born in 2050 to grow up and want to play an NES game - especially on an ACTUAL NES with an ACTUAL cartridge?
Like it or not, classic gaming is in a dying market that isn't changing with the times.
I think for it to thrive once again, pixel art games need to showcase they have worth as an art style and that they can be just as complex as 3D games.