The name thing was a big deal for many, but for far more was the banning itself.
Getting banned on google plus for whatever google decides on a whim is against its terms of use that day (e.g. stupid name policy) will also nuke your gmail.
Far too many people were dependent on a free service with zero guarantees back then, many still are - there is just no reason to risk losing your gmail over cat updates when facebook is completely separate.