If Mittens starts a losing streak, he may bow out to make way for Jebbie.
"Jebbie" will get slaughtered in a primary.
The Bush association is a partial factor in the demise of governor Perry. No one wanted another Texas governor slaughtering the English language and causing people to wince every time he approached a microphone for 4 years.
"Jebbie" is Bush III and the people won't stand for a monarchy. If he runs, the Bush family will be portrayed by the left as "Satan's first family".
And there will be no one on the right willing to bother to stop it.
"Jebbie" as a candidate could only be dreamed up by people with such a disconnect with reality that it's frightening to believe they exist within the GOP (not you, personally, I hear them talking about it as well.)