It's too bad they couldn't have NES, SNES, Genesis, and N64 from the beginning, but you have to start somewhere.
I do fear the "trickling" strategy as well. Nintendo needs to pick up the pace a bit with this VC, since it's really just replacing its predecessor. Hopefully we get at least two games a week or more, but I'm not holding my breath.
They really need to make the Wii U VC attractive before the end of the year. Obviously titles like Earthbound are wonderful. But, I'm thinking that high-profile series should, this time, get more immediate release schedules. Get all the Mario, Kirby, Metroid, Zelda, Mega Man, Sonic, and Castlevania games out sooner rather than later.
Part of this is wishful thinking for my own benefit, but I honestly believe that it's pivotal to make the Wii U VC exceptionally strong by year's end.