If Sony releases Pulse for PS2 (maybe with fixed handling) I might think about finally buying a PS2!
But after I have seen how Sony plays around with the WipEout brand, I think we should be pretty happy if they just release a 1:1 PS2 port of the game. I really doubt they change anything in the game.
And, concerning how long Pulse is available for PSP now, chances are getting smaller to see a PS2 version, IMO.