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The hyper-capable leaving behind those too hide bound to advance.

I see this, too.

A conflict then ensuing.

Why? I think the extropians will just leave the planet, probably with technology that humans can't even understand. They may stick around to maintain the earth as a human zoo. If so I expect that would take their zoo-keeper role as seriously as most other zoo-keepers do.

Alternately they might just disengage.

More than likely, that is exactly what will happen. An enhanced-human Diaspora. Of course, this leaves the rest of wretched humanity wailing that it "isn't fair". Envy and bigotry are huge social forces. More than enough to try and start a dust up. Anything that is a perceived threat would get the "it's for the children" treatment.

Advances I'm seeing coming to fruition fairly soon are computer/net interfaces, immune system revamp, re-engineering of entire gene sequences in fully developed biological systems. Any one of these gives a huge advantage over those who, for one reason or another, don't want to be "improved".

Frankly, the idea of extended life span, increased damage resistance/repair, and a direct neural feed to computing systems would be my "buy in" criteria. Computer enhanced eidetic memory alone would almost be worth it.