Hate to tell you, but they've already started doing some linking behind the scenes on some accounts. The speculation is that it was done if you used your primary email address as the backup email for the account.

That being said, it looks like if you don't use any services that requires Profiles, it shouldn't matter to being able to use the account. If you use a name that looks "normal", where normal seems to = White Middle America, it shouldn't matter to being able to use the account.

Whether you want to use your account or not, that's another question. I'm "lucky" in the sense that Google has always been my search engine. To fragment my data, I use different free services when I need a throwaway account. I don't do online calendering, I pay for my picture hosting, I don't blog via Google, etc. So if I lose my G+ account - I only lose G+. Many people who are on G+ don't have as much "freedom" as I do when it comes to how they want their name to look.