Well, it doesn't break the laws of physics, so it already more plausible than wishful thinking FTL tech.

Another scenario I could envision would be if we get a good handle on the tech to live and work in space to the point that living on a massive space habitat is indistinguishable from living on earth.

Then we hollow out an asteroid and build a mini biosphere. Give it a push with a massive space based array of lasers, and off we go to another star.