Republicans nominate Paul Ryan at convention. Trump announces he will run as independent. Republicans already predicted this and have a plan in place to poison him or assassinate him because they know they don't have a chance of winning if Trump runs as independent.
This is a joke by the way. But I really wouldn't be surprised if it happens.
Hilary's VP will be Tim Kaine. It's almost guaranteed now. Trump's VP has to Kasich or Guilliani. he needs someone with high name ID and a positive, respected reputation. Rubio maybe if he can depress anti-Trump turnout in Latino sects, but he may lose credibility aligning with Trump anyways.
No if people didn't vote for Kasich during the primary they definitely won't vote for him as VP in a general