Trump and his "Gravy Seals" would be incapable of anything coordinated like seizing power. Their J6 coup attempt, while shocking, did show that when you get a bunch of semi-literate mouthbreathers together and you amp them up they usually just tear shit up without being able to achieve anything in particular.
I think if Trump loses bad stuff WILL happen but it'll be hot spots of enraged yokels and not a large-scale coordinated effort. They only PLAY supersoldier with their AR-15's at Starbucks but it's mostly a fantasy on their part that they will actually be a "force" of any sort.
They'll make things very unpleasant for a while but ultimately they will burn out I suspect. Besides after a few hours they'll want to get home to see Matlock reruns.