frankly it is cheaper resource and energy wise ..and time wise...to download (if ever the tech gets close enough...) everyone and everything into a matrix-esque environment where time is sped up (or slowed down depending on one's viewpoint) powered and sustained by a reactor for 10's of thousands of years (here our time...there...far far longer...) to sort out all the problems and difficulties we have...technologically, environmentally, and socially ...then decide what we wish to do...
go "further" in...deeper still...
or come back to a planet that has had time to recover from our stupid stupid pointlessly consuming excesses.

endo-travel (inward) is much more resource effective, affordable, and likely to succeed in the time-sensitive constraints we have ...
than the cost and hazard and likelihood of failure than that of exo-travel (off planet)