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In fairness, I don't think anyone is talking about making all of YouTube something you have to pay for, only selected channels. To use a cable analogy, it is as if you could get your basic cable for free, and only pay for HBO so you could watch righteous Game of Thrones action to your hearts desire. Also, early reports I've seen are talking about $2 for month for each channel, so to stick with Game of Thrones, if I could watch a months worth of episodes for $2, I would be shelling out those dollars like I was Littlefinger. But unfortunately, that's not going to be an option.
YouTube made a billion dollars last year with user created content, so it's not like they are hurting. I will be surprised if there are a lot of people that start paying to view specific channels.