While I totally appreciate the sentiment, I think that going ONTO YouTube to post that would be counter productive wouldn’t it? The only way to post it would be to have a G+ account, and the very thing you are protesting is the fact that they are trying to force a G+ account on you. The problem is that Google knows YouTube is a mainstay of the Internet. They can do whatever they want with it because in the end, people are still going to use it.
So if you really dislike what they have done, don’t use YouTube or G+. Show that you wont stand for them ruining YouTube in a selfish attempt to push their own product.
To be completely honest though, I already had a G+ account anyway (never use it) so it didn’t really effect me But while I am perfectly fine with them doing everything to weed out, shoot, kill, maim, slaughter, and burn the scum of humanity that attaches themselves to the Youtube comment section, I don’t think forcing G+ on people is the way to go.