It's normal to be skeptical and I hope after we'll start HackAdemy, EH community to participate on this project.
My name is Marius Corici and I am Co-Founder for Hack a Server project and HackAdemy.
As I said in the article, there is a need and I am sure HackAdemy can fill this need. We already have over 230 registered users as we speak and over 1800 on Hack a Server who would be willing to learn from people like you; well trained and experienced specialists in security. For example we already have receive requests from people who like to share their knowledge about InfoSec industry.
HackAdemy will never replace good world wide companies that train and certificate ethical hackers. HackAdemy is the place to complete those companies.
Is like Open Source but for knowledge: Open Knowledge.
And if I have this opportunity, urge you to help us with whatever you can: Feedback and/or taught others.