This is why Eliezer thinks Ayn Rand was stupid.

No it isn't. (There may be other people who Eliezer thinks are stupid for this reason. Ayn Rand is not one.)

This is why the next supergenius born in 2020 will think Eliezer was stupid.

Probably not and said person probably will not think Eliezer is stupid. In the same way Eliezer doesn't think Janes, Douglas Hofstadter and others who fall into approximately the correct contrarian cluster to be stupid.

This is why our kind will do many awesome things individually or in small groups, but at the end, the barbarians will always win.

The essay you link to does not support the position you are expressing. I agree with the article and suggest your "at the end, the barbarians will always win" is a hasty generalisation.