They would not give them a lease because it wasn't viable! Wimbledon aura had long since vanished, hence they dropped out of the top league in 85, closed in 91 and then struggled after reopening in 02. As for Coventry, the last time I was there was towards the end of 2016 and the place was virtually empty
Im very sorry to burst people's bubble, but the facts are that speedway in the UK is not viable financially. No businessman with any credibility would touch it with a bargepole because they will never get it back, no matter how much half a dozen supporters jump up and down.
There will never be speedway in Wimbledon again. Ditto Coventry, and the sooner these people accept it and move on with their lives the better.
British Speedway needs to prioritise what it has left, not waste time chasing list causes. Harsh yes, but true im afraid.