Obviously they should make both and we'll get 2 new Devil May Cry games within the next 3-4 years.
Things that would never happen. I'm hoping Capcom isn't crazy enough to make it a competition, but it's not far-fetched to think that the DMC4 re-release is to gauge interest in the original series.
I personally don't have an interest in DMC4. If it continues thats great news for the fans who like that. For me it wasn't really continuing anything original about the series. It was the beginning of a new series of games featuring Nero and Kyrie as the new main characters.
It wasn't continuing Dante's story, so I didn't see it as part of the original series. I saw it as a reboot as well. Maybe thats the wrong way of looking at it, I don't know. If Capcom want to continue DMC4 thats fine, but I personally lost interest in the series after DMC4. DmC brought me back.
It seems to me DmC is the game Capcom want to push. They will be streaming the game every week until it releases in the new year. I hope Ninja Theory hit 9s and 10s this time, because I really want to see this game reach its peak and then hopefully continue with a much better story.