Space on earth is finite. And even if add more hypotheticals like us becoming an interstellar species (actually I'd wager that's less unlikely than overcoming aging), in absence of aging exponential breeding would eventually outpace even the fastest space frontier colonization imaginable.

Yeah, and if you go from 100 year lifespan to 300 years and survive the societal collapse, would you be happy then? What about in 300 years?

Eventually all the atoms we know and love will decay and "disappear."

Give me a few million years of life and I'll still have billions more to think about what to do in the event of a heat death of the universe.

About that exponential breeding thing, I’ve got some bad news. You’d better sit down…