Based on POTUS' response in this exchange, he sounds confident the electoral college will vote for him, though he said if they didn't it would be a mistake. Nonetheless, he did say "certainly I will" leave the WH if they did, adding "but I think there will be a lot of things happening between now and the 20th of January, a lot of things".
Trying to figure out how the sequence plays out if not all 50 states certify their elections and seat electors by Dec 14th. If for example only 45-49 states certify their elections and submit the slates of electors, would a vote occur with just those electors requiring them to choose a majority winner from a smaller pool of votes, or would it go to the house for a vote (in which case each state gets only 1 vote for POTUS, and that is cast by the state delegation in each of the 50 states, of which Republicans have a majority in 26?
https://twitter.com/abcnews/status/1332101191933673473
https://www.abc.net.au/news/2020-11-27/donald-trump-says-he-will-leave-white-house/12926866
https://www.fox6now.com/news/safe-harbor-deadline-heres-why-dec-8-matters-in-the-2020-election