How's this for an idea: Continue with the current system of market capitalism until humanity is wealthy enough to have colonized a few planets, then switch to socialism and kick back.
I see it as delayed gratification on the societal level.
In brief: capitalism is not defined as "unpleasant thing that creates lots of wealth" and socialism is not defined as "pleasant thing that costs lots of wealth". Not AT ALL. There are vast issues at stake in any choice which can be framed as "capitalism vs socialism", and none of those is "how much wealth would it take". We already have MANY times enough spare wealth for no-one in the world to starve, yet somehow people still do.
The last thread didn't fare too badly, I think; let's make it a monthly tradition. (Me, I'm more interested in thinking about real-world policies or philosophies, actual and possible, rather than AI design or physics, and I suspect that many fine, non-mind-killed folks reading LW also are - but might be ashamed to admit it!)
Quoth OrphanWilde:
Let's try to stick to those rules - and maybe make some more if sorely needed.
Oh, and I think that the "Personal is Political" stuff like gender relations, etc also belongs here.