20 years, You are looking very short term, this is generational and will affect our evolution.
The differentiation of tastes would probably be mindblowing in a world without scarcity.
At the moment it appears so because the world has over the last few decades been opened up to a view of many other cultures (through gloabalisation/internet) but, we can already see that when it comes to tastes in movies, music etc, there is a globalised popular culture that didn't exist before and it moves rapidly.
The nuances of locality are being lost. Diversity is being lost even as it appears to be increasing. Throw in the competitive cognitive artefacts and the loss of skills to them, in time we will potentially start to devolve, much like the emotional state of the generations.
With artificial superintelligence we'd finally (maybe) have a shot at getting answers to some of the toughest questions in existence.
Indeed they will.
With increased global communication we are indeed seeing a disappearance of local culture. But that would be expected from the globality of mass communication alone. On the other hand, cultural differences arise on a different basis when people interested in similar things can communicate over long distances.
I think that it will expand interests to a point and then eventually stagnate or turn into virtual worlds where skills are illusion.
That's possible. What would be left after the outsourcing of all intelligence and virtue would be an infantile, reactive and self-centered core. :D
Politics?
Something like that but confined to a sandbox limited to things like dog poop along footpaths with all serious matters left for the AI's to take care of.