As a AAA game developer, the more people play our games, the better.
Obviously I get where you're coming from but when we're looking at AAA-games I just don't see how their first-party output will manage to adhere to this strategy. I'm not that worried though as with every generation people will, for the most part, quickly move over to the next consoles and leave the previous systems collecting dust.
Black Ops 3 is a good third-party example of this btw. It was a mess on last-gen consoles and while it did sell 1,7m on X360 (as of 2016) that was nothing compared to the 14m and 7m units sold on PS4 and XBO, respectively.