One additional question: do you think in 5 years we will be capable to fly spaceships with lots of people?
Not without physics that go beyond Einstein's world of relativity. If we can control gravity, I have no doubt that 5 years is plenty for humans to solve this.
Maybe:
  • you might not need a ship
  • we can build a vessel that's bigger on the inside than it is on the outside
  • the journey to our new planet is only a few minutes round trip with this new tech