I would probably get Crystal, even for an inflated price (I'm guessing these'll be $11.99 if they happen). Gen II is still my fave, but I have Gold, so I'm curious about the additions and changes. Plus, it's nearly impossible to find a cartridge with a working battery, and even though I have the tools and knowledge to replace them (did it with Gold in fact), it's a hassle I don't want.
Pokemon Soul Silver and Heart Gold are basically Crystalized versions of those two games. I'm still buying this. I bought Red on the 3DS and I'm having a great time. I'm currently grinding to beat Gary on Victory Road. I still haven't gotten my first badge.
Based upon how much fun I'm having playing Red and Yellow over the past few days, I'd like VC versions of the Gen II games, if only for convenience's sake.
I mean, I have my original cartridges of all three games, and the means to replace their save batteries, but that's a ticking time-bomb; all of my progress will inevitably go away as soon as the battery runs dry and I have to replace it. While it's not like I plan to pass my 3DS down as a heirloom or something, it'd just be nice to have probably my favourite Pokémon games exist in a form that means I can still go back, 10 or more years down the line and pick right up where I left off.
I never played Gen II on the GBC, but I have played Heart Gold and have already transferred my Pokemon from there to Pokemon Black, and then to Pokemon Bank, and they're now on my copy of Pokemon X. It was a huge hassle but I don't really have the urge to go back to GSC.
Besides, I'm really excited for RBY due to the nostalgia, but outside of that? The games from Black and White and onwards are just so much faster paced. Going back to HG feels like a slog due to how fast the text scrolls and all that.