To make other people happy, it would be completely optional to link those accounts together - but keep them separate, for some reason.
To make other people happy, they should be able to use one account to do all of the those things.
Finally, to make other people happy, Google should just be a search engine with 10 blue links.
What changes (if they really do what the original blog post suggests) is this: * They remove the up/down votes system internal to Youtube (which is already a full-fledged system, where you have a stream where you can see when someone you follow likes something, etc) * They move 'share to Google+' from the 'Share' submenu (where it already is, alongside with Facebook, Twitter) to where the up/down votes were
BUt I don't have a Google + account. Though not for Google not trying. And frankly I don't want one. FB is enough for me.
As far as I know, the migration from Youtube accounts to Google accounts has been forced some time ago (I tried to avoid it as long as I could).
And, I already get the +1s (or thumbs up, or whatever it's called) of the people I follow on Youtube, in my Youtube stream. And I do like things there. On the other hand, sharing ? I'd think twice before doing it.