One reason people would get VC games is for the novelty and because they're huge fans. I'm probably going to only get Earthbound and SSB for the VC. Earthbound because like every other Earthbound fan out there, I have a cult-like affinity towards that game (and also because EB carts cost around $70-80 on ebay), and SSB because having every SSB title in one system would be pretty damn close to perfection. Other stuff I can just play on the old systems themselves.
Anyway, anyone ever heard of Kaillera? Using certain emulators, you can play games from NES, SNES, N64, arcade, Genesis, PS1, and a bunch of other systems online. I normally wouldn't use ROMs, but the prospect of being able to play these games online was irresistable. And guess what one of the most popular games is. That's right, Super Smash Bros for the N64. If Nintendo were to release modified versions of some of these games on the VC including online support, fixing some bugs these games had, or adding multiplayer to games that seem like multiplayer would be a no-brainer but don't have it for some reason or another (like F-Zero), it could mean a jump in VC downloads and happy customers.
Also, online gamers = hardcore isn't true. Take a look at WoW, MapleStory, Counter-Strike, Starcraft, etc. Most of the people who play these games online aren't hardcore gamers. Nintendo really needs to get online going.