[CM30]

It's also probably worth pointing out that the future of space travel may not be trips made by people in their lifetimes with the knowledge of science that exists now.

If we can somehow figure out how to keep astronauts in stasis some way or the other, that would remove the need to get anywhere in under 100 years or so. If humans become cyborgs and lose the need for standard forms of nutrition or air, that helps too. If methods for life extension are found, the same.

And if that fails, well there's always robots. Or potentially colony ships. Nothing says the automated ship has to be 'on' for the duration of the journey, only the launch and destination.

with any of these ideas, the speed of light becomes even less of an issue.