Would you believe it if they did?
I think the legacy of Bush Sr. is "Read my lips..." The lesson was simple: the fastest way to undermine the President is to get him to reneg on his signature issue. Bush lost it when Democrats convinced him to raise taxes.
The message to Trump is that he cannot compromise on building the wall. He can't move to an e-wall or some other virtual policing of the border when people want the physical thing in place. What he can do is leave gaps in treacherous or hostile desert terrain, while focusing the wall in high traffic areas, but he has to deliver on his signature promise or his voters will turn on him as just another Republican liar who will say anything to win.
-PJ
Trump destroyed whatever might be considered the "Bush Legacy" when he went off on Jeb about Iraq during the South Carolina debate. That had to sting.
And politics aside, Jeb is still part of the Bush family, and I'd have a hard time pimping for a guy that killed off my brother/son.