They want a reason to remove the current Californian government, as well as manufacturing a reason to enact emergency powers which can 'help' Trump push for a third term. They have been discussing this since before the election.
A better question is, does he think he'll still be around?
I mean, this is a guy who put out a press release about his own health where everyone could tell he was lying because it included his own height and they just found pictures of him standing next to other people who were supposed to be the same height or shorter.
Well, let's not forget writing his own "medical assessment" for his doctor to sign off. With gems like "I can confidently state that Donald Trump will be the most healthy and strong man to ever take the Presidency"... not to mention "positive findings on every test" (uhhh, a positive finding on any medical test is an abnormality, Donnie).