As I mentioned in Part 2 the WWE has plenty of people within the four walls to handle the wrestling portion of the promotion when the time comes. I believe that Stephanie can remain in her position and Shane takes control leaving Triple H in the position he already has in talent development. I know that Wall Street may have an issue with Shane, Stephanie, or Triple H taking power when Vince steps away, but they have the proven track record in the wrestling industry and that's the part that should matter not having a background in business.
I know that it might not make a ton of sense, but the wrestling business isn't like most other industries and having a background in business might help in the board room, handle stock holders, and business agreements, but it doesn't teach you how to run a wrestling company. The only way to do that is to be in wrestling and learn from your mistakes, and having been able to learn from some of the greatest minds in history gives said person a great starting point. This is the opportunity that was afforded to Shane, Stephanie and Triple H as they've been able to learn from Vince, Pat Patterson, Dusty Rhodes, Paul Heyman, Jim Ross, and various others.
Overall the best choice for WWE is to keep with what has worked in the past and that Vince passing the company down to the next generation and continuing the McMahon legacy, because they can handle it. Triple H, Shane, and Stephanie deserve a chance to prove the critics wrong and their supporters right by taking control of WWE and making all the more successful. The best decision is to move them up and allow them to surround themselves with business minded people that would help handle the non wrestling part of the business to allow the McMahon's to focus on the wrestling side of things. Seems simple in my mind, but the only that is clear is that any change will not be taking place until Vince McMahon decides it's time to step back and be a mentor or retire.