We have already seen some tests where Google replaced the Like/Unlike buttons on the YouTube videos with the Google +1 button. They have not yet commented on the criticism considering it is still not widely applicable.
Google has however made a change that is rather surprising in nature. They have replaced the Google +1 button on the YouTube video pages with the Google+ Share button.
This button appears when you press the Like or Share option on video pages.
The problem with this change is that the +1 button is now totally gone from the YouTube video pages. This could be an indication that +1 button could eventually replace the Like/Unlike functionality on YouTube in the near future.