There is no chance of a repeat of the January 6 riot; the government will be prepared for that. There is also no chance that Harris will do what Pence correctly refused to do and overturn the election by herself. Is there nonetheless some danger that Congress could go rogue and declare Trump elected over the will of the voters?
Yes, if given the opportunity. Congress would be a critical part of a plot involving the creation of sets of alternate electors at the state level. If the GOP controls both houses in January 2025, the threat of an overturned election is very real.
The remaining PBPs in Congress would do their best to protect the integrity of the system. Would there be enough of them left to prevail? At this point–after “legitimate political discourse”–who knows?