You are partly right, but in nearly all cases it was corporate greed that caused the jobs to move. I am aware of NO case in which a company dropped their prices when they went from paying $18 an hour to $2.99. Are you?
Unless something changes with the constitution, there will be no "next time" as he is limited to two terms of office. The 22nd amendment limits the president to two terms and would require a 2/3rds vote by both houses. However, he could run as VP...
Why not, it's possible to buy drugs, humans, machine guns and assorted other banned things. Bringing it back and being able to legally use it are another matter.