Honestly, if this game- Devil May Cry or not- is to sell much, it's going to have to reach to the legions beyond DMC like more commercial titles like God of war do. Believe it or not, most of the sells are going to come from people who weren't keeping up with the development, interested in the fan controversy, or cared much for the previous games. They will be people who are sitting around and see an awesome trailer one day and say "Holy **** that looks big and epic! Whatever that is!" That, honestly, is really how games sell. Marketing is key. This game better have freaking huge awesome cinematic flare and epic scope presented in grand fashion in the trailers when they come out. That, along with Ninja Theory's performance capture bringing characters to life should turn new heads. This game won't sink or swim with the established DMC fan-base alone. Their aren't enough of them for or against this game anymore that can to raise or hurt sales.
