You’re ascribing an awful lot of foresight and planning and purpose into their actions. Trump is, and was, anything but deliberate and goal-oriented beyond the myopic motivations of the moment. While the Republican party might some day possibly feel that Israel is in some vague form no longer to their benefit, they are vastly more motivated by a perceived Enemy. The Republicans, and Trump especially, will gravitate much more strongly toward “Blow up Palestine and nuke Iran if they get involved” than they will to “The current world order favors Israel, and we want to shake up the global status quo, so we’re pulling our support from Israel.”

They want a simple message with a clear enemy, that’s what brings out their voters, not vague ideas of world politics 3D chess.