https://www.theguardian.com/football/2016/oct/05/west-ham-karren-brady-stadium-move
Having just enjoyed the Apprentice, here is Karren "who farted?" Brady's thoughts on the stadium move. If you can't be a*sed to open the link, then I can summarise - it's a roaring success.
I'm sure they feel that and I'm not close enough to WHU politics to know the details, but they must have realised an athletics stadium may not be best suited for football.