It will certainly be military operation. We have to remember President Trump wasn't betrayed by republicans on January 6th, it already happened on January 1st when Senate republicans joined democrats to override President Trump's VETO for the first time ever. Before this happened, CCP Mitch refused to add removal of Section 230 on the bill or get rid of Warren's amendment to remove names of confederate generals from several military bases. January 6th just added rest of the top republican leadership(+Pence) to a big list of people who have betrayed President Trump. When first arrests happen, expect to see tons more to follow immediately after because time window will be very short as rats will try to flee the country fast.
One could say republican leadership and many republicans put all in on January 1st and they must've known there is no coming back from their betrayal. This was also the defining moment when President Trump knew he could no longer rely on any kind of support from Senate republicans(to pass any bills) so in President Trump's eyes he is againts 100% of democrats in House and Senate. Being a President in this kind of situation is very pointless and hard because you can't get anything done. The only way to get out from this is to allow military to arrest key people in each parties for treason and force others to co-operate and then silently retire after their term ends. Why not arrest all of them? Qpost 15 provides great explanation to this
"The corruption that will come out is so serious that deals must be cut for people to walk away otherwise 70% of elected politicians would be in jail "
So pretty much you can't arrest them all or else normal people will lose hope as they see how utterly corrupted their "elected" people really are and it's hard to rebuild and recover from that.
https://www.nytimes.com/2021/01/01/us/politics/senate-override-trump-defense-bill.html