Gap closing predictions! Which will happen first? PS3 x 360, PS360 x Wii, Wii U x PSV, PS4 x PSV, Wii U x PS360, PS4 x Wii U.

[Sensei]

Okay guys which gap will be closed first in your opinion (WW sales)? Examples:

PS3 surpasses 360;
PS3 or 360  surpasses  Wii;
Wii U  surpasses  PS Vita;
PS4  surpasses PS Vita;
PS Vita  surpasses  Dreamcast;
Wii U surpasses  PS3 or 360;
PS4 surpasses Wii U;
etc etc.

Feel free to suggest other gap closings, but try to avoid the easiest ones (i.e. PS360 closing on PSP, etc).

I'll try something bold and say PS Vita surpasses Dreamcast.