Is there any word on the dlc yet? The level cap increase was the primary reason I bought Broken Steel, but after I hit lvl 30 I lost my motivation to play again.
It may just be that non-"hack-n-slash" RPGs aren't your thing. ARPGs like Diablo/etc or console JRPGs like Final Fantasy, where you can keep grinding your levels (although it gets really long between levels as the enemies get weaker) might be a better fit.
Personally, I don't get the whole "if I can't get more XP / level more, I have no motivation to play" concept. My first playthrough of FO3, I probably had 3 to 4 times the play time after hitting the cap. My characters in World of Warcraft spend much more time at the level cap than they do leveling (like F:NV, there's things to work on after the cap - reputations, better gear, story, etc). Lots of other games, I've happily kept going after the cap.
(Of course, the more linear a game is, the easier it is for the designer to figure out how much XP you can get by the end, and make sure that the cap is very close to that point. I recall some of the Bioware games I've played being like that..... Obliv / FO3 / F:NV being about as far from "linear" as you can get, it's pretty hard to balance the cap with how much there is to do.)