I would rather they stop with these DLC's and save the other stuff for the next game. I would hope Bethesda stops current gen development after Skyrim,which is asking a lot I know. I would rather see a Bethesda game as a next gen launch title. Assuming the 2014 platform cycle prediction is correct. They could give obsidian the creation tech for another fallout game this gen, though 3 years is still a lot of time to not have a title.
Three years (i.e. Fallout 4 in fall 2013) is a conservative and probably legit estimate. But keep in mind that from Bethesda's point of view the idea is to alternate between Fallout and Elder Scrolls, so they probably are thinking in terms of Skyrim later this year and then DLCs for it next year keeping people busy through 2012. And technically, Bethesda released Fallout 3 two and a half years after Oblivion, so an earlier date then fall 2013 is possible.
Realistically, some people at Bethesda are already working on Fallout 4 because once things get locked down, designers and writers move on to the next project while artists and programmers finish up. And Bethesda may have learned some things the last few years that could help speed things up when it comes to the next game.
We can hope, anyway. :thumbsup: