Level 50 sounds kind of ridiculous when you can destroy everything at level 30. Think they'll add any more high level creatures to the wasteland? The balance will be crazy bad if not.
There will be a new trait (that can be retroactively taken) in Old World Blues that caps your level at 30.
Chris Avellone posted in another thread that certain NPCs (he mentioned Benny & Lanius) will now be scaled to your PC level. I don't know if this will be in a future patch or part of a DLC.
It looks like players who wish to maintain a challenge will have to be judicious about starting SPECIALs, Perks, Traits, Skill Books and gear choices. Like the song says, Nerf Yourself.
We have to remember that the majority of game players are a lot more casual than the handful that hang out here, and they like it bigger & better. That's where the money is, so that's the emphasis. Luckily for us, the devs are like us and have taken care to try to keep us happy, as well.