I think its a highly probable outcome. But so many variables. In any normal political cycle you get two parties led by two leaders who put the best proposition forward. This time you have an absolute cult of morons who are aided by a big chunk of the media who will not stand up to the blatant lying and hypocrisy, they go out of their way to promote it. The idiocy of it has been normalised and social media is a wild west of information. Normal campaign rules don't apply as they can say anything and people believe it. It makes it so hard to call and that is even before you factor in the legal drama.
Assuming Biden stays and looks healthy and Trump goes on trial then I think its hard to see anything other than a Biden victory and possibly a big one. They have so much material to campaign on (Abortion, Jan 6th, Democracy....).
But if Trump can dodge a trial and Biden has any kind of health wobble it feels wide open.