Infamous did almost 500k in his first month. It's much better than 150k. But yeah it's not 5-6 milion seller , same for KZ ( which sold more than 2.1 ML as January 2014 ).
Right, I mean, I think it's actually been getting a lot *worse* for those kinds of games over time.
Guerrilla is now working on an open world RPG for example, which is a very big genre, but also has less established competitors than the FPS genre.
It's not entirely clear what Sucker Punch is doing at the moment, but they did resize the entire studio to work in pre-production for quite a while before hiring back up for whatever their new idea is. I don't think Sony actually made a bad decision on that front since they probably assessed that a straightforward Infamous 4 was unlikely to do anywhere near that.
That's part of why I predicted Quantum Break to do worse than The Order even though it seems to be a higher quality product with a better developer legacy, since it was releasing a year later.