I'd definitely want to see a way to carry over virtual console stuff, but I don't even think that should be a part of the discussion. Really, everyone wants to be able to use whatever they purchased to as great an extent as possible.
We've had a thread like this before, and a lot of people actually said they'd like to see the use of solid state media, or basically anything that wasn't optical media, for a variety of reasons. Some ideas were that non-optical media, like an SD card-based format, is more difficult to damage, and can easily contain game saves. Personally, I think utilizing a secondary media drive would be useful in providing "lock-on" capabilities more often. I loved that aspect of Sonic & Knuckles, and I really think providing games on both a primary and secondary format would encourage expansion titles, in a method similar to DLC, but make retail releases much more possible and visible to all consumers. I know that a second disc could be released, like with Super Street Fighter IV, but still, I think this method would encourage an expansion system.
That said, a lot of people also want more built-in storage, or a simple way to increase storage on the console. I know if someone told me they could safely and quickly switch out the half-gig NAND on the Wii for something that could hold 8, or even four gigs for a reasonable price, without causing me to switch to over-complicated homebrew, I definitely would take it. I'm literally nearly out of space with JUST game saves, VC saves, and VC game suspensions. That's after I removed all the Wii-Ware and VC games, themselves, off my Wii. Running out of space will soon grow to be a scary thing, and soon, I'll be forced to switch to an alternative, anyways, unless I want to lose gamesaves.