I have seen this banded around a bit, and it really isn't a solution.
I 'firewall' different social networks, my YT access and my Google+ access are usually performed in 2 very different contexts and I have
no interest in people or personalities leaking from one to the other.
Now, you are offering a pseudo anonymous solution, but that is an insufficient firewall for my needs.
Maintaining privacy across multiple networks, some of which contain my personal life, some my work life, some my social life and some my internet life is hard.
There is simply no freaking way I am going to trust a company which cares a LOT less than I do about my privacy be responsible for maintaining it.
BUT luckily this whole thing really doesn't affect me directly, my firewalls have not actually been affected.
I was just hoping to communicate why the suggestion you are making is not actually an effective solution for anyone who cares about their privacy.