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