I like this idea. At a minimum be transparent about your expenses so that we can properly judge whether 25% is too much or too little. I've heard from several people who say, "But they need 25%". Well, if you're not part of their team then you really probably don't know that. It could turn out that they need even more to take on the things they're trying to achieve. But we'll never know unless they share their expenses with the community.
But I like your idea of a roadmap for what they're trying to accomplish. And knowing that there would be a decrease in "fees" over time would probably inspire more of us to continue on with dtube. I personally would love to say that I was a pioneer for decentralized video hosting but I'm afraid I can't do it at the rate of 25% indefinitely.