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2.8 billion years[0] is the high estimate before _all_ remaining life on earth goes extinct. Likely including these little buggers.

[0] https://en.wikipedia.org/wiki/Timeline_of_the_far_future

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based on our current knowledge, not only of the science that we can extrapolate to the future, but of our technology and how we will apply it

note that that list is all negative things we suspect will happen and include no accounting for our own intervention in matters

I'm not sure how anyone's intervention could ever withstand some of these effects.

I could foresee maybe a sun shade of some sort to help mitigate the increase in temperature, but at some point the sun is going to envelope the earth.

Also, this several billion years into the future. Anyone left wouldn't be anything you could remotely call human. Evolution hasn't stopped in humans.

iirc we could plausibly move to Titan and live off nuclear energy

Why not just move the Earth? You could do that over a few million years using a gravity tractor.

https://en.wikipedia.org/wiki/Gravity_tractor

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