Lets be honest here, this franchise never was that great in comparison with others from Sony, not to mention terribles decision about release date.
Horizon will always about graphics. The rest of this franchise is niche. I got the first game day one and was OKish, the DLC made a night/day difference from the base game.
They will probably englobe the franchise sales plus the VR game from now.
I'll be honest, was a damn good call from someone inside Sony to not kill Kratos because that franchise is probably the best Sony can offer right now.