Do you think Trump will stay in if poll after poll continues to show him losing?
I get that he NEEDS to win if he wants to avoid prison, but can his fragile ego take losing again? He couldn't handle losing the popular vote in 2016 and he WON that election. 2020 showed how internalized he takes being a two time loser.
Yes he'll stay in and yes he'll call it rigged and yes he'll do everything he can to subvert the results if he loses. Watch for trump supporters at the state and county levels, they will 100% try to refuse certification if the results do show him losing.