Trumps base is starting to erode.

[GODZILLA]

His base won't erode. He could publicly set a copy of the Constitution on fire and his base would cheer him. He could do what China's president did and his base will cheer him on. The problem is his base is too deluded to accept the fact that they voted for a fraud. Look up the sunk cost fallacy when you have a chance.

Even after "caving" (pardon the pun) over His Wall?

Nope! They won't. They have proven to be so obsessed with him they will do anything it takes to validate their support for him. He is their Messiah.