Theres gonna be 100m+ PS4's and 50m+ XB1's, and PCs out there too.
Unless The Switch really sell well (near PS4 levels) I doubt they will bother.
Most people get 3rd Party games for the most powerfull system they own....
which would mean people that own more than 1 system would likely not get it for the Switch.
Its the same old same old. Its also why alot of bigger 3rd party simply skip porting titles to nintendo systems.
100 million PS4's? What time frame?