Not that they'll necessarily succeed, but just try something.
Think about it: These people literally, unironically believe that Biden/Harris are Satanic, cannibalistic, commie pedophiles who illegally stole the election from their God Emperor (Appointed by Jesus himself) and are going to round up and execute all Patriotic White Christian Americans. These people also have way more guns on average than normal people due to this psychotic paranoia.
Are all of them really just gonna stand by and "let that happen"?
Personal prediction: At least one chud will be detained by the Secret Service for trying to get in to the inauguration with a pistol or something, but no one will be seriously hurt or killed, much less Biden/Harris.
Nah, the Q people will probably just convince themselves that Biden's a hologram and that Trump is still managing the US government from an undisclosed Army base in the Balkans. Trust the plan.