Twitter does this much better. They allow people to be whatever/whomever they want. But in case YOUR identity is important to you and your following, then you can get your account verified: https://support.twitter.com/groups/31-twitter-basics/topics/...
Well, Twitter isn't providing this to the public anymore. Mostly because they are saying that the surest way to prove legitimacy is to link to your Twitter account from your website, or other properties.
Isn't this so much better?
It is better and I'll tell you why. This G+ policy won't stop bogus accounts because Google can't verify all the accounts created. But guess who'll get hurt - it won't be the spammers that sell viagra.