Originally Posted by rkw
Also if you notice there are a lot of reviews now that have ideas it say simply "a Google user". Those are reviews that have been converted because they were posted prior to this new linking to your Google+ ID.
That's not strictly the case. Your 'Google+ ID' is your normal Google ID, the one that you have to have to be able to buy apps for your Android advice from the Play store.
Google decided that they didn't want anonymous or nicknamed reviews any more, so changed the rules so that all reviews would be posted under the user's ID - in exactly the same way as this works on, say, Amazon. The list of your reviews on your Google+ page is also a parallel of the reviews list on your public profile on Amazon.
I can't see how this change would encourage non Google+ users to start using it, which seems to be the motive you're ascribing to Google.