I have obtained Yellow since the announcement that Sun/Moon would be compatible with these rereleases. Was contemplating Red, but my discovery that it's only available in black and white really put a damper on that.
Probably just going to toss Pikachu when I get another viable Pokemon though. I just can't stand the fact that I can't evolve it. Fun fact though, this is my first time actually OWNING my own Gen I game. I've only played through a friend's copy of Blue once, and then I had to return it. Yellow at least will be a bit of new, because of how unusual it is. That's another contributing factor to my choice.