The new site will be lauded as the next "great white hope" plans will be made looking forward to a positive outcome, meanwhile Abbey stadium will get demolished and housing built way before any infrastructure goes up at the new site, then there will be a reason the new site cannot be completed, take your pick bats, newts, wild flowers, natterjack toads. etc. etc.
Maybe there just are not enough cynical people in councils and governments with the b***s to say build the new stadium completely and get it up and running before you destroy the old one , any verbal agreement from the developers is not worth the paper it is written on, and most of the agreements/guarantees written on paper are worthless as well