OTOH, those having the lower intelligence seem like they would prefer a world of declining brainpower instead, and ASAP.
To them it's just too intimidating like it is now.
You can't expect such intelligence-dependent things like that to be much different when it comes to artificial or imitation intelligence of any kind.
That would be so uncanny as to be unrecognizable.
Only in so far as they themselves are still just as intelligent relatively compared to others.
The answer is undoubtedly yes IF that intelligence is distributed rather than concentrated. Further concentration of intelligence (power) would be detrimental.
Edit to clarify: I mean distributed in the individual sense, not regional or governmental which fall into the detrimental outcome.
My point was that I think it's hard to argue that the world, as in Earth and it's non-human inhabitants, are better off because of human intelligence. So it's questionable whether more intelligence would change that.
If anything I think reduction in distributed intelligence would and has made the situation far worse.