Will they take advantage of Skyrims incredible succes and make TES:VI next, or do you think they will make another Fallout game? Or maybe a new IP.
I'm asking, because Skyrim is such a big thing now, and it would make sense for Bethesda to take advantage of it and release another TES game next

I will easily put my life savings down on it being Fallout 4. When they announced Skyrim they also announced they were in the pre stages of another project.

I hope that they take their time and not rush and cut content to meet some stupid date.

I have played Morrowind / Oblivion / Fallout 3 and Skyrim, excellent games but all need Bug Squashing. Thankfully there are the unofficial patches (PC) that correct this.

They're going to greenlight a bunch of lame spinoffs developed by other companies, wait five years before beginning development of TES:VI, and release it console-only, full of bugs, and with half the features. At least that's been the trend.

I would say they are taking advantage of Skyrim as we speak, what with the DLC's and all.
I could go either way: TES:6 or FO4.
Here's a prediction for you, though. The next TES won't be out before the next generation of the Xbox.

I beleive it's been said by the Devs that they're working on a system where they have two staggard development teams going at any given time.

One works on TES series, the other works on the Fallout series. One releases their current project while the other is working on theirs. So, Fallout 4 is next, but the TES team will be working on TES:VI once they finish up with the DLCs for SKyrim and have been greenlighted for their next project.