[johnnyanmac]

Well the big flaw here is that he just outright throws away the idea of FTL travel. A lot of that friction will be reduced if we ever figure out how to break that (which yes, is extremely tricky. Even IF we figure it out we'd need to also counter time dilation to properly verify).

Now sure, the politics on who and what gets to go to thr next world will doom many. But physics can alleviate the whole "we'll tear each other apart over 200 years of space travel" part

[layer8]

FTL implies time travel. The into-the-past kind. Good luck with that.

[johnnyanmac]

I won't be the one to solve it, but we thought the sound barrier was unbreakable a few centuries ago. I won't underestimate human ingenuity.

I think more likely is we figure out wormholes. If we can't go light speed we can instead fold space like a piece of paper and reduce the space we need to Traverse. That may or may not be as easy as FTL.

[layer8]

Wormholes imply time travel in much the same way as FTL. There is no escape from this, for very simple geometric reasons.

[johnnyanmac]

If space compression is time travel, sure. It's not like we can't time travel right now (to the future).

I obviously don't have the finer details in line.