He's extremely motivated to try, and the GOP sees no reason to commit to a peaceful transition of power. To them, there can be no legitimate Democratic victory.
I think it's far past time to stop being all "come on, Trump wouldn't do that!" and take a good hard look at what would stop him. Is it laws? Laws can be changed.
We need to stop acting like democratic backsliding is something that can't possibly happen in the US.
I'm not putting Trump past it, but the idea he could get away with it is just so laughable. The white house isn't the presidency. He would be forced out if he loses because he won't be president after inauguration day.