In a million years we’d have had a Dyson sphere for nearly a million years and colonized almost the entirety of the galaxy already.

We unfortunately wouldn’t have colonized Andromeda quite yet though.

Any utopia first requires the basis of free energy. Dyson spheres are the start and the logical first outcome for any sufficiently advanced civilization. Fusion reactors being used as needed where we can’t donate from the former.

The rest is all politics. The vast majority of people are good. When everyone isn’t fighting for the same resources, the population of earth stabilizes in 2100 to about 11 billion people.

The growing pains until then through space colonies and terraformers will be admittedly rough though. Space radiation and the classism in that vacuum will be terrible for the poor and disenfranchised.

https://www.pewresearch.org/short-reads/2019/06/17/worlds-population-is-projected-to-nearly-stop-growing-by-the-end-of-the-century/

https://science8sc.weebly.com/uploads/1/3/2/7/132773018/milky-way-galaxy-light-years_orig.jpg

https://interestingengineering.com/science/what-would-it-take-to-create-a-dyson-sphere

https://www.youtube.com/watch?v=HpcTJW4ur54

https://www.youtube.com/watch?v=uzkD5SeuwzM

https://www.youtube.com/watch?v=LEENEFaVUzU&