Not to mention loss of other google services. When my account is suspended tomorrow, they tell me I will also lose access to Picasa and Reader. People have lost access to gmail, although that is supposedly a bug (although I have already moved all my mail to fastmail.fm).
To their credit, they gave me time (four days) to download my data, which I've done.
And even if I don't lose access to gmail, who's to say that won't happen on purpose in the near future? It's obvious that Google wants to leverage + as much as possible.
What about ad sense? Google apps? Everything is potentially targeted for pulling into the Plus system.
Finally, I've heard that beyond Picasa access, loss of your G+ profile interferes with Android utility. I don't know specifically what, or even whether that's true.