They seem to be hanging their head hat on getting the courts to flip the results in 3 States and have the courts just declare Trump to be the winner.
Giuliani openly spilled how they're really thinking of all this at The Four Seasons, when one of the reporters told him that the major TV news networks had just called the election for Biden. He did a mockery of how anybody listening to the networks was supposedly acting: he put his arms out and his face up like a person in church who thinks he's feeling/channeling The Spirit or whatever, and wailed "The networks! All the networks!..."
...then going straight into the next line without pause but this is the really crucial part...
"...Judges don't matter!"
Notice that it's not the law, or the votes, that he thinks should matter instead of the networks. It's judges. It's the same courts that the Evil Turtle has spent years packing ahead of time without most people noticing it until the last few months.
does he actually believe that he might win this? If so, he's insane. If he doesn't think he's going to win this, but is just doing this because he can, then he's an *******... And of course it could be a false dichotomy.
Plans for what to do with the next several years of your life can be a pretty sticky thing to try to let go of even when you know that what you were planning won't work, or isn't as good as an unplanned available alternative, or both.
I got a degree in one field of work (X) several years ago, didn't get a job in X after graduation, tried for a long time to come up with alternative routes to get into X, and stumbled into another field of work (Y) along the way that's working out better in some ways than X would have. Normally, I either don't think about X anymore, or think of it only as a part of my past and maybe even as something that I'm better off without, when I'm reminded of how much better my life has gotten since dropping my pursuit of X and leaning more into Y. There's just no doubt at all that Y is not only the only one of these that I really can possibly do at this point, but also the one that's just better for me anyway. And I mostly don't even think of X anymore anyway, so I know I'll never even try to get back into that again, not just because it would be a bad idea for practical reasons, but also because it just doesn't even cross my mind enough. But, the next time my official registration for X is due for renewal, there's still a feeling I can't get rid of, of wanting to pay the dues and remain registered, as if I were someday going to start trying that again.
. I agree. A working group at a think tank war gamed out the different scenarios of this election months ago and in none of them did the group think Trump would concede. They considered serious resistance from Trump and in every played out scenario it fizzled. 
