I have been asking this for myself (even if I don't have any published levels yet lol) for quite a time already.

Would you make all (or your most famous) levels again in the new LBP Vita?

I thought about making this when LBP PSP first appeared, but as it only had 2 layers, and much more technical limitations, that possibility of all those remakes was near impossible.
But now again, with the release of LBP Vita, it is supposed that everything you can make in LBP2 without including stuff from DLCs can be made in the LBPVita, so, would you like to recreate your levels with a Vita twist (all those touch controls) on them, or would you like to make something new?

Also, do you think LBPVita will "replace" LBP2? If it is the same, but Vita is portable... Will Vita's version replace the PS3's version?

I wouldn't... mainly because I cannot buy a vita, lol. To answer your second question, no, I don't think the vita will replace the ps3 version mainly because they would have to pay for a brand new system and the game to play it.

Well I don't have Vita and I'm not a fan of hand held consoles so therefore I might not even getting one. I have PSP and I don't really like playing it, LBP for PSP was very furstating for me. Sooo no LBPV for me but IF I had it, I would definitely not revreate them. I think it's like another game, so I don't find it useful. I'm not 100% sure yet about getting Vita and LBPV for it. Probably not. I'm getting LBPKarting thoygh. I love racing and LBPs so I guess I'd like it. I wasn't in Beta so I don't know yet.

Nah, I don't think LBPV will replace LBP2.

If I have a Vita and LBPV maybe!
But only 1 or 2 levels!

Well im going to try and re-make some...And I plan to remake some of my songs.

I would expand my mind to LBPV-ish things