I really don't get how Nintendo are thinking on this one. Make NES, GB, SNES, GBA, N64 games accessible on the Switch and they solve any issues there may be with keeping older players interested between the dispersed big name titles. Surely they know this, so what baffles me is why the drip feed approach? I assume support for the above will come in time, and I also assume it's not a technological constraint making it unavailable right now, so there has to be a deliberate strategy to not making it all live from launch (or even better, from console launch).
It's a real headscratcher. The only rationale I can come up with is they think slow release will keep subs bought in for longer, and encourage new waves of adopters rather than a big glut at the start which slowly recedes as people play what they want then get bored. I guess they know their business but for me it means I'll probably just sell my Switch with nothing I really want to play on it in 2018 now.