Instead of a Crystal/Emerald/Platinum version, I wouldn't be surprised if they incorporate the two games into one. Or rather, I would be glad if they did. I am not sure how they would connect the two into one. Perhaps, there could be a new area where data from both worlds can be exchanged. I haven't played the original White/Black myself to give any specific ideas.
Thoughts? Would you like to see something like this for the 3DS? Or at least an updated version for the 3DS?