As a sony fan and a SP only player I am very happy with the type of games and quality on the playstation consoles. I would say that each of the 3 devs have their own identity and type of gamers they care to, and in the case of sony they like to experiment with different types of genres/IPs and basically try to cater to every niche. Its worked for them in the 7th gen, its working with the ps4 right now and I see no reason why it wont continue to work.
I mean, looking at Titanfall which you have mentioned above - it has sold very well but hasnt been the system seller as much as MS have been hoping. So I dont think your reasoning really holds much water.
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