N64 isn't nearly full speed on the PSP side of things. N64 emulation is little more than proof of concept on the PSP. Admittedly a decently well optimized proof of concept, but ultimately it never did much more than run Ocarina of Time okay in a relatively playable fashion as long as you shut the sound off. SNES emulation is far from perfect on the PSP, and even GBA emulation is lacking in certain areas. There's a lot of room for improvement on the Vita. Plus, all you're thinking is emulators. You do realize this is opening up homebrew completely, right? Who knows what homebrew applications we'll get. Emulators are really bottom of the barrel stuff once you start getting into a system. Emulators are on everything, and they simply aren't special.
As well, do you honestly think the 3DS is capable of anything that resembles full speed N64 emulation? If it were, don't you think someone would have, I dunno, hopped on it by now if they thought it was possible? Considering how picky N64 emulation can be, as well as the fact that it's not even perfect on Android yet, I'd be a little surprised if someone had enough motivation to try to fine tune an N64 emulator on the Vita, much less the weaker 3DS.
Basically, your opinion is uninformed shit. Don't post stupid stuff and then tell people to basically not call you out on it.