In both cases, the parameters of a plausible and fair deal are perfectly obvious to all of the parties. The deals never happen because they come with risks that the principal parties view as being unacceptable.
What could change that? For the immigration issue, it would have to be a resounding defeat for the GOP in 2026 and 2028. For the West Bank, it would be some sort of dramatic change in the balance of power in Israel’s backyard. Potential revolutions in Egypt and Jordan come to mind.