WITH A FUCKING 2ND GEN i5 AND 4GB RAM IN 2012.
Assuming pc hardware=mobile hardware
which it does not. The weakset link to the switch is its cpu but no doubt it should be capable of running dolphin if optimized well.
Problem with you all is that you jump to assumption that "X console is very powerful so it can run console Z" but that takes a lot of effort. AFAIK I have yet to see ps2 emulation on another device besides a ps4 or a PC (or on ps3 If you consider it emulation).
Gamecube: a port of dolphin from mobile device with some upgrades should do the trick (keep in mind not every game could run)
PS2: No, as good as the PS2 emulator is on pc,trying to get a decent working PS2 emulator would be a Hassel.
Wii: very possible just like the GC