As big third-party publishers keep getting bigger and bigger, their budgets explode correspondingly. That kind of money you just can't risk on something new and unproved. It just won't fly against investors.
That's why all the most expensive New IP projects now are nothing but "X meets Y", where "X" is the latest fad, while "Y" is the most popular game right now.
WatchDogs = "Hacking meets GTA"
Titanfall = "Pacific Rim meets CoD"
Destiny = "Halo meets WoW" (i guess)
This calculated approach apparently DOES work (see WD sales) but it creates generic, hollow products.
As these big guys (EA, WB, Activision) keep destroying smaller competition, gaming lineup dries up from a stream of games to several big hyped-up releases where all videogame sales are now concentrated.
And all these big releases are gonna be either yearly rehashes or "new", "X plus Y" IPs.