This quote is from the last thread, but it's something I wanted to chime in on.
Oblivion was released in March 2006 and Fallout 3 was released in October 2008. This is not 4 years and 3 months as one of the earlier posts said. This is only 2 years and 7 months.
It's 4 years since an Elder Scrolls game. Fallout isn't an ES game and so some ES Fans won't be including it in their projected timelines.
I will say that if they made Elder Scrolls fans wait 8 years between games (in the fast paced world of gaming nowadays, as opposed to the 90's), I could see TES 5 doing less business for them. That long of a gap in a genre overfilled the way that fantasy RPG's are nowadays will leave a bad taste in current ES Fans mouths.