Bait and Switch Win? Could the GOP Be Playing Games of Deception?

I can't help but wonder if the Donald Trump strategy was planned all along by Republicans.
Put him as a placeholder.
Get down to the last couple weeks.
Force him to drop out (the only way he can be replaced on the ticket)
And replace him with someone who has to do no work, comes in as a savior with great unifying talking points, and walks away with an election after no vetting, campaigning, accountability, or familiarity with the American people.
Knowing how desperate and deceitful the GOP is, I wouldn't be shocked if they did it, and knowing how the American people, particularly many conservatives, are gullible and able to be manipulated, I wouldn't be surprised if that candidate won.
(For the record, I'm thinking either Mike Pence, John Kasich or even Mitt Romney, but wouldn't be shocked if they didn't do Cruz or Rubio, either)
That would all be a nightmare scenario, and the only way the GOP could possibly win this election.
I hope my prediction is wrong.