I hope not as I still managed to escape all the pre-selected checkboxes to tie my account with g+

When I clicked the "endorsement" link, I was redirected to a "Join Google+" page. So I guess it's only applicable to Google+ (now).

I don't know. It looks like this is for using ads in social search. Technically they are pushing hard to make YouTube just a subset of Google+ though, so who knows what extent this affects people, but it seems pretty restricted right now.

Gotta whittle people down slowly :)