[The Cajun]

Maybe the speed of light is really unbreakable, no warp drives, no wormholes, no etc.

If that's the case, than expansion into just a portion our galaxy is a 'tough row to hoe'.
Expansion to another galaxy, virtually impossible.

[MeganC]

“Expansion to another galaxy, virtually impossible.”

It’s only going to remain ‘impossible’ until someone figures out how to make a profit from it.