Solar and wind energy generation are great, but don't have a high ERoEI in early development. Oil that's gushing out of the ground has an insanely high ERoEI and we used that to advance our technology very quickly.
Also remember that we probably have only a few hundred million years left before the sun expands and heats the planet to the point were complex life can't exist. There will be no liquid water in 1 billion years.
This is all conjecture. It certainly could be possible that future civilizations can become space faring by a different path than we took, but that's a terrible gamble to make if you think intelligence in the universe is worth preserving and expanding.
1. https://www.treehugger.com/more-trees-than-there-were-years-...