Not really. NWP is a collaborative and rare occasion where you get two giants under one roof. It will attract oldschool and new school ravers/party goers.
Ferry Corsten actually came out of semi-retirement for this so I would say people who understand the electronic music scene and respect the originators will definitely come out to see this. People will come out of raver retirement to see this show happen. At least to sit at the sidelines and hear them together. I don't think they will be performing together for a long time either since they are both in what I would think their last golden age of their careers. Newer crowds will also go to see them because it's the "IN" thing right now as the announcement was made over ASOT 600.
Hardwell only appeals to newer crowds, but just personally I don't like his style of djing or track selection. I am not saying that Hardwell will sell out over NWP or vice versa, because there is a much larger younger "raver" generation than when I was young, and everyone knows the name Hardwell.
I just feel the NWP performance will be magical and if both were playing on separate stages at the same event at the same time, I would easily choose NWP > Hardwell.
PLUR