RE: Chelsea: I think we can read "unfavourable investment climate" as "Abramovich didn't get his visa and doesn't want to play anymore". I never believed those who said the stadium would be self-financed with no help from Abramovich. He might not have been funding the whole thing but clearly the idea to have such an expensive and grandiose design (with no revenue streams apart from football) was his - he saw it as a grand physical legacy of his ownership. Without him pushing for it and using his wealth (at the very least) as a backstop, it looks like it's very quickly become impractical, too complicated and too expensive to realise.
Chelsea are more than capable of self-financing a stadium. It seems to me they're not capable of self-financing that design.