I think that there is a lot of agendas being pushed around and exaggerations used when discussing DmC's quality or where the franchise goes.
I would say that the "lowest" DMC as a franchise got was EXACTLY two or three weeks before the game's release, when the only indication of the game's quality was the demo and a few badly edited, vulgarism-based trailers.
But I am pretty sure that the majority of those that bought DmC actually enjoyed it. If you were against it from the first place, you most likely did not buy it. But upon release, DmC did many things right. The whole game was WAY less vulgar/simple than the demo bits suggested, the Vergil DLC was simply phenomenal, gameplay-wise AND art-wise as well, the PC version could not be more better if they tried to, and the patches improved a bit on the style issues as well (although not as much as it would have needed, but that is a whole different debate).
Just like when a bad FF game might have had the successful prequel's positive momentum to ride on, and then its sequel suffer from its bad qualities, so I am absolutely sure that no matter what will follow DmC, it will have better sales and a positive momentum to ride.
If it is DmC2, it will be because NT has proven that they CAN create a good game, and any sequel can only speed up the combat, fix the obvious issues, and spend little to zero time on estabilishing Dante as a character (not to mention potentially years passing, giving us a more mature Dante
![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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And if it is DMC5, it will be because Capcom can bathe in the positive applaud from the most vocal fanbase of the genre, and they can say "we listen", which, luckily ,seems to be a positive thing to say if you are a not-so-loved company with oh-so-loved franchises.