The SNES is pretty much the best-emulatable console in the world, thanks to Higan's low level emulation. Anything more modern than that requires tricks and optimizations to run even on the most modern PC, which is totally fine. Most emulation inaccuracies do not matter to the average, non-purist player, and emulators can add additional features like real-time saving, fast-forward and high-res textures. In fact, the problem with emulating old games is not emulation inaccuracy - it is the fact that you probably do not have a screen that would give you the original experience anymore. Systems like NES and SNES, and most importantly the games that run on them, are designed with old analog CRTs in mind, so purists will not only need the console itself, but more importantly the proper screen.
As for your argument, Mr. Riot, you are right about that. What matters most in gaming is the games themselves. You can have the greatest platform, it is worthless if you cannot play a thing on it. For that matter, this is practically the only differentiation the systems have in the first place. Technically, they are pretty much interchangable, aside from Nintendo's strategy of disrupting the market with novel input methods while leaving raw power aside. Still, while this fact makes platform exclusives play a bigger role in what system to get, it also makes their very existence more frustrating. Which only makes Valve's Portal 2 PS3 deal seem so much more awesome.