People might slag it in public, but I think a lot of people secretly enjoy leaving abusive and trollish anonymous comments. It's not like all those comments were the work of a few bad apples. The sheer volume would suggest otherwise.
The downside is that the people who put in the effort to nurture high quality comments on their channels, and the people who have been high quality commenters on youtube are the most negatively impacted by these changes. And the negative impact on the highest quality of comments might end up reducing the average quality much more than any moderate impact on the volume of the lower quality comments.
This also assumes that Google+ comments will kill off these high quality comment channels. I am sure it is true for some, but it is hardly the absolute death knell for quality conversation to require a Google+ account.
Google actually has something like 7+ different comment systems. And yet for some reason they felt compelled to cram youtube's square peg into google+'s round hole because that was the only reasonable technological solution? Because that was the only possible way to improve the situation?
Bullshit. It's because they want to prop up google+ and they want to make targeted ads easier.
No, but beware of falling into the politician's syllogism.