Why don't we just use 'the entire population' for behav. gen.? The deCODE dataset from Iceland N=38167, 12% of pop.http://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1003520#s2 …
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I think measurement error will be a bigger limit than whether one has 20 million or 200 million genomes.
For finding causal variants? Perhaps. Hard to say. Maybe simulate some GWAS data and see? May take a long time to run!
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Just a matter of sampling error vs corrected, see GCTAs. eg 20m IQ datapoints with r=.5 worse than 1m with r=.9.
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