Speaking as someone who is a around the 'next generation' and may of my collage/ late high school age friends have at least interest in retro games. Sure, not all gamers care for the old, just as some people like new pop songs, and some like classic rock.Hell, as I said, look at me. I'm 20 and probably a good 1/3 of my collection is older than me. I am not nostalgic for any retro system, except maybe the GBC a little. I
I think anything before NES is not going to ever be too sought after. The games are too simplistic and hard to hold the attention long. But I think as long as Nintendo is around making new systems, the NES, Gameboy, SNES, N64, NGC, and maybe Genesis will keep interest. Sonic is the biggest think keeping retro SEGA in the lime lite. My music channel that does chip tune music, and a large portion of my audience is 13-17, many are vary young. Nintendo keeps binging retro gaming to light for younger generations. I got into retro games after getting Mario Kart DS, then Googleing Nintendo and then found the AVGN.
It's hard to say Video Games are JUST collectables, when I think the Music or Comic comparison suits it better. Super Mario Bros. is a great game, just as Sgt. Peppers Lonely Hearts Club Band is a great album, and Spider Man is a great comic series. Beanie Babies are useless sacks of cotton, it can't be enjoyed much more than being put on a shelf. It was locked in it's era and no one after it's hype cares. Super Mario Bros is pushing 30 years, The Beatles and Spider Man are pushing 50 years, and none of these things are fading from the public eye, and all 3 are timeless.
Find an instance of collectible commodities which hasn't gone through this cycle, I dare ya.
Beatles LPs still hold their value fairly well.
Prices will stabilize at some point, because who in their right mind will pay $50 for a Super Mario/ Duck Hunt, but they will never 'crash' in value in our life times. The only thing that will drive prices down is a majority of the people getting priced out, even I'm at a point where I'm not adding to my collection much due to cost.
-Gah people posting faster than I can-
I think it's hard to compare figures to video games, They are making more Star Wars toys, and it's not like a kid is going to go "Oh this 2015 Luke figure is great, I wonder how they looked in the 1980s" VS "Super Mario 3D World is great, I wonder how older Mario games were like"