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Yea, we're talking about sending people out on trips that could last for hundreds/thousands of years, with no way to provide support or backup if anything goes wrong along the way, to go to other planets that may not even be habitable when they get there. We don't know if there's any other sort of faster-than-light travel even possible, so there very well may not be any space travel shortcuts. Chances are "the great filter" is just the astronomical distances between everything and so all life eventually figures out it's better to just stay home. If anything, maybe the best we can hope for is to convert all the mass in our solar system into a Dyson sphere and just wait out our Sun for a few billion years, that may be more realistic than travel to another star system (maybe slightly less impossible).