That video could sum up problems with many ongoing series that forgot their identity. At least Zelda recognized that it strayed too far from its true roots, being actual exploration and the sense of adventure, but it took them way too long to get back to it. Final Fantasy just never knows what to do with itself, and it hasn't since like FF6. Castlevania most definitely ran into the ground after the bomb that was Lords of Shadow; they had two main types of genres within the series before, being classic arcade style platformer, and Metroidvania style gameplay, both of which were well received. Then they go and fuck it up with whatever the hell Lords of Shadow is supposed to be, and decided it needed a sequel. Megaman has undeniably lost its roots, which is what eventually ended up spawning Mighty No. 9.
It's like the companies don't know their own series. It's quite laughable that they'd end up fucking up so bad, when they started with something that was actually well received. How exactly does one knowingly, and intentionally stay on that path? Maybe they just know it'd sell well, just BECAUSE of the title. They could literally make a shitty Mario phone game, and have it sell millions, just because Mario is in the title.
So we can't put all the blame on them either, but also, the people stupid enough to buy anything and everything, just because of a title. If they didn't do such nonsense so blindly, and spoke with their wallet instead (collectively), then maybe these companies would actually pay attention to what the fans want. All they care about is your money. If you (collectively) knowingly buy a game that's clearly not going to be up to their previous standards, you're just encouraging them to continue that behavior.