For Nintendo, Pokemon is more than just raw numbers for the games themselves. It is a system seller by being exclusive, a core Nintendo strategy. And the most money from Pokemon isn’t even made by the games themselves, but from merchandise and other licensing around this IP. But what I could see Nintendo doing someday is, releasing a game that is not mainline Pokemon and its sole purpose is to “advertise” Pokemon on other platforms like Steam. They tried it already on mobile. Maybe release the mobile games on Steam too, like this strange Super Mario Bros game on Android.