I'm all for relationships but, honestly? I think the whole relationship hopeful thing for EITHER of the girls is pretty much done. I mean he hasn't shown much interest in Carly since season 3 or 4, and he's apparently moved on from Sam already. I'd say it's pretty much over for that....
As for a prom episode, that would definitely be interesting, but cliche. It'll probably happen, as every single nick show seems to have one