I don't feel that generations of video games will simply disappear. As long as people like AVGN stick around on the internet, the existence of NES, Atari, Commadore 64, I feel like any curious gamers will at least be aware of the video game roots. There are PLENTY of let's play channels and Internet personalities which are still highlighting some of the primitive consoles and franchise
I do think there's a point of which some platforms have simply become inaccessible. But then we have platforms like Virtual Console and the PlayStation Network. It's digital, but consoles like the NES, SNES, Nintendo 64, PlayStation 1 & 2 do still have there place with Nintendo and PlayStation (not so much with the PSVita). We even have Steam and GOG bringing some older PC and MS-DOS games to the digital market.
Then we have the Developers themselves like Square Enix which knocked it out of the park with Bravely Default finally realizing what people loved about there earlier RPGs and the long awaited reveal of the FF VII remake, yes it's for new platforms, but if that isn't acknowledging what they did right in the past, I don't what is.
Key Developers breaking away from the shackles of publishers to make the games they themselves (and the fans) want, inspired by there own past accomplishments. It's happened with Rare and Konami and I bet there are more to come. The future might not contain the old consoles themselves, but we can tell that there are developers out there who want to carry the flame in a respectable manner. The traditional game collecting of a shelf full of cartridges may become even more scarce, it looks like it's becoming more digital, but in the end it's about the games, it's about the experience right?