If Bioware is going to look at other companies, they should look at Obsidian, not Bethesda.
Bugs aside (and they are well sorted out now) Fallout: New Vegas is IMO the best of two worlds. It combines a strong narrative with an open world, and it does so effortlessly. It has memorable characters and events, something no Bethesda game has ever provided. On top of that Bethesda's games might have an open ~world~, but often (Fallout 3, Oblivion and Skyrim, I am looking at you) a linear and very weak story.
Slight spoilers for DA:O and FO:NV below.There's freedom in New Vegas, not only regarding exploration, but also in what route to follow through the game. Where Dragon Age: Origins pretty much have a fixed ending, kill the Arch-demon and save Ferelden, New Vegas has a far more open ending. You partake in the Second Battle of Hoover Dam, yes, but fighting for whom? NCR? The Legion? Mr. House? Or your own character?
And if we want to discuss sales, New Vegas sold more than both Dragon Age games combined.

So there, Bioware. Have at it!