At the same time, all of those points except the luck one could be presented as evidence that the IQ required to be eminent has increased rather than the converse.

I disagree for several reasons. Mostly, conscientiousness, conformity,etc are personality traits that aren't strongly correlated with IQ (conscientiousness may even be slightly negatively correlated).

IQ in general strongly predicts academic success in grad school, and competition tends to winnow out the poor performers a lot more than the strong.

Would it surprise you to know that the most highly regarded grad students in my physics program all left physics? They had a great deal of success before and in grad school (I went to a top 5 program) , but left because they didn't want to deal with the administrative/grant stuff, and because they didn't want to spend years at low pay.

I'd argue that successful career in science is selecting for some threshhold IQ and then much more strongly for a personality type.