We need less Bushes, not more.
You will probably get that wish in any event.
The war and all the misinformation surrounding it will assure that no one, or damn few, will cross over from the Dims to vote for any future Bush candidate.
The border issues and spending will not go away during the present administration and will keep the conservative base away from any future Bush hopeful.
Jeb will stay put in Florida and any of his kids will have to content themselves with starring in cross-border corporations and a small chance at being ambassador.