You touch on it, but I think the reason the deletionists won out was that Wikia was Jimmy Wales' for-profit alternative, and Jimmy Wales was the Nexus of soft power on Wikipedia.
He didn't have to tell anyone "Get as much stuff out of Wikipedia as possible so I can make money off it", that was just going to happen institutionally as a result of his clout and conflict of interest. People would obey in advance, and people without enough radar to realize they should would lose out against those who did.
He didn't have to tell anyone "Get as much stuff out of Wikipedia as possible so I can make money off it", that was just going to happen institutionally as a result of his clout and conflict of interest. People would obey in advance, and people without enough radar to realize they should would lose out against those who did.