Campaign promises are made to get elected, not to be kept. Given Trump's tendency to speak, shall we say, "freely", he is likely to be a much more moderate president than his campaign promises would suggest. Not that that is saying very much, but I think much of the panic and disbelief surrounding a Trump win arises from taking his words too seriously and too literally.
All I can say is that if your hope for a politician hinges on him not doing what he's expressly said he plans to do many times, that's a terrifying situation to be in.
It will be interesting to see if people leave specially if announcements were made on FB/Twitter. The convenience of online medium and harshness of offline life can't be beat.
If you hold him to his campaign promises, at least 11 million Americans will leave.