As much as we can hope, would make no sense for knighthead to put a speedway track on the wheels site, it's going to house the stadium, academy etc, I think they want to emulate what Man City have done, also they'll want to put apartments and probably a hotel and I think a star city like complex on the site so that last factor in mind a speedway track would hamper that and just basically take up space in there eyes could be of better use.
Last thing, you say "knighthead have no interest in any form of motorsport" but they have a literal racing team that compete in Le Mans 24 hour, the "hertz team jota" team and I think Tom Wagner is good friends Jimmie Johnson who is a nascar driver. They have interest in motorsport just perhaps not speedway