PGA of America makes the USA Captain choice. Since I am not a member, I have no idea how much "input" is solicited. Also, as noted by this Euro pick, the isn't a "requirement" that their Captain has a Major win to qualify, since Mr. McGinley has not won a Major. In the US, a Major victory is required.
I have seen nothing but praise from the Euros so far on Mr McGinley's selection. He was/is a "players player," so I'm sure he will resonate in that regards. While he never won a Major, he was a tough competitor in the Ryder Cup, so he knows how to win in the format.
Will surely be interesting to see him match wits against Mr Watson!