I don't expect the Republicans to just up and drop Trump but it's really sad how much they're willing to abide for the illusion of power. Because the best they're doing with total control of the federal government is a shit slate of bills even they can't stand. They're evil AND they're bad at it.
And there's a much bigger risk than just giving up on one year's worth of legislative movement by standing by Donald Trump. They won't look like they're just putting up with the president or controlling his worst impulses anymore, which was their big excuse in the general election. They're aiding and abetting him as he engages in really abusive, incompetent, crazy activity. Hardcore Trump supporters won't care. Wavering voters and inactive Democrats and independents probably will.
And what will they see? "A party interested in small and fair government?" Surely not. The Republican brand will risk being totally conflated with this creepozoid of a president.