Bethesda likes you just as you are, Capital Wastelander. At the very least you don't need to keep working on that level grind in Fallout 3, as Bethesda's Jeff Gardiner confirmed to MTV Multiplayer that the game's level cap won't be raised beyond 30. (Back in May, the game's Broken Steel DLC increased the maximum possible level from 20 to 30.)
He did, however, note that he's "sure we'll [Bethesda] look into addressing these concerns in future games." Though the company is farming out development of next year's expansion Fallout: New Vegas to Obsidian, the Fallout IP is still very much in Bethesda's hands -- making us wonder if we'll see what Mr. Gardiner is talking about as soon as next year.