PS1 stuff might run slowly if the technical challenges can be overcome. Everything else like PSP and GameCube...hell no. It's not going to happen. The 3DS doesn't have the specs to pull it off.
We don't need another discussion thread about 3DS emulation of unlikely consoles. There's been too many already. This is about as stupid as asking if we'll get N64 emulation on the Nintendo DS (hell even the 3DS would have trouble pulling off an N64 emulator).
Come on, you should have learned by now how pointless a thread like this is.