You are quite wrong about that.
There are lots of Republicans - most of them, in fact - who not only pose no threat to the regime, but who in fact support it without reservation.
Did you know that East German Volkskammer had not just one, but eight or nine opposition parties?
The Republican Party, as presently constituted, recognizes the "leading role" of the Deep State, the equivalent of the Social Democratic Party in East Germany, and as long as that is true, elected Republicans - in the minority, OR IN THE MAJORITY, will continue as a vital part of the regime.
The regime could not exist without the Republican Party.
So, stop worrying about the GOP. As long as the Deep State remains in power, the GOP will be just fine.
Accurate, concise and depressing reply.