A serious problem for Trump's plan is that Biden is running again and he will be in power.
If Slow Joe runs again, it can only help Trump. May not even need a coup, given that CNN et al keep finding new ways to give him free advertising.
Democrats should get off their asses and nominate someone with a pulse but I doubt that will happen, so they'll probably go full QAnon and start accusing Trump of fraud if he wins.
It seems some Americans are starting to finally stop supporting Trump. Maybe the coup won't have any conditions to go ahead.