in 2000 years or so
At 25 years per generation that's only 80 generations or so.
In comparison, rats reach sexual maturity after 5 weeks, gestate for 21 days, and have about 5 litters with 7-14 baby rats per litter.
That's about 6 generations of rats per year. Conservatively.
We will "evolve" in 2000 years about as much as rats "evolve" every 13-14 years.
Not squeaking much.
On the other hand, it is also optimistic considering how pessimistic people tend to be regarding our survival on this planet at all.
Which IMHO has become a ridiculous notion for quite some time now.
There's too many of us at too many places at the same time for most things to wipe us out as a species.
Many things could fuck us up significantly... say a nuclear war... but we are too dispersed to be completely wiped out by anything that would not wipe out all life on Earth almost instantly.
But people love their antiquated 19th century ideas... After all that's only about 5 generations ago.
My parents' grandparents' time. Well... except on my mom's side.
She had a grandmother who lived to be 102.
Not much room for evolution there. Of genes OR ideas.
But in 2000 years... we'll get some shit done on the ideas front. That we've shown that we are capable of.