Well if it can be done, then it's a good idea. Perhaps you can get safety barriers than can be folded down. I am sure these are options that are being considered and Hood certainly didn't rule out having some standing inc in the revisions.

German stadia have removeable seats, but I suspect they cost a mint.

Fans always seem to place a higher premium on standing than clubs, both in soccer and RL. Alnmost every Premier League club seems to have atmosphere problems and even where there is some, it is based around groups of fans who stand in their seats throughout the game, supposedly illegally.