Again, I think it all depends on how this whole idea develops.
We got to remember that YouTube are simply adding this feature, and is not forcing it on all popular videos. The owner of the video has an option to either turn this renting service on, or disable it all together for his videos. Even if he chooses to enable it, the money goes to him and does not reach YouTube - not all of it anyway.
Having said that though, I would never pay to watch someone like "freddiew". Not going to happen.