Admittedly they do say "It is a myth your entire Google account will be suspended because of violating the G+ real-name policy". But they do not say, and would

Admittedly they do say "It is a myth your entire Google account will be suspended because of violating the G+ real-name policy". But they do not say, and would have to to make me comfortable, "we will not force any G+/real-name policies on users of other Google services". They're just saying they won't just suspend you over it, not that they won't force a transition at some point. I don't fear for my data with Google like I would with other companies, but the continuity of that address is its value. If I'm forced to change it I won't bother coming back.