Now they have their own game and IP, Dragon's Dogma. It seems that they're pretty happy with their product. They're releasing a lot DLCs (Not Disc-Locket Contents) and they're developing Dragon's Dogma 2 at the moment.
Why would DMC3-4 director and team want to go back to work on DMC games after they got their own IP and it's selling much better than any DMC game?
On the other hand, Kamiya and P* can't touch DMC anymore after the DMC1, because of their relationship with Capcom.
I hate to break it for you, It seems that DmC will be the last Devil May Cry game, No more DMC games and no more DmC games for sure.