Point 1.
We saw Halo and Call Of Duty become series that saw games come out every year or every other year.
So. What gives. Why not get another studio in here to do the same? You could very easily have a game like Fallout 3 come out. Then another studio do a rehash of sorts like New Vegas.
1yr Skyrim (studio A)
2yr DLC (studio
3yr Skyrim rehash (studio C)
4yr DLC (studio
5yr fallout 4 (studio A)
6yr dlc (studio
7yr fallout old york w/e (studio C)
This obviously wont occur. But as you can see this gives enough time in between development for new games from 2 studios with a 3rd taking over dlc reigns. So you then have a maimization of this franchise. WITHOUT any big chance of losing quality.