They would be right to be scared. I don't think anyone in their right mind would put any faith or trust in Stephanie McMahon or Paul Levesque to run things. Unfortunately I don't think either of them ever envision the day of Vince McMahon not being there, I don't think they'll know what to do.
As much as the WWE has changed their image in the last 9 years and they have done a good job of it, I think many older people still feel the WWE is Vince McMahon and without him it's not WWE. The WWE has lost millions of viewers in the past 15 years, if you found someone that used to watch WWE but doesn't anymore I bet you one of the names they will mention is Vince McMahon and all the things he used to do, same with Hulk Hogan and Ric Flair and Ultimate Warrior and Steve Austin and The Rock, Vince McMahon is a household name like they are and unfortunately the wrestling they remember from 15 years ago, 20,30 years ago no longer exists. It's just spot monkeys and regular looking people but for many that don't watch, that's the wrestling they remember.
I think they're right to panic. I've already said it here many times, the wrestling I knew no longer exists and it's not existed for many many years and I can't imagine what WWE would look like without Vince McMahon in charge.