For the life of me I can't imagine how you take an 80,000 seater £5/600,000,000 athletics stadium and reduce it to a 25,000 capacity football ground. What do you do, knock half of it down? Either that or the people at the back are gonna be half a mile from the pitch. Absurd.
(Livingston in Scotland, when they were called Meadowbank, played in the stadium built for the Commonwealth games in Edinburgh and that was daft enough, three men and a dog in a huge arena)