One of the issues with Google, is that it's a "one-stop shop." There's a lot more than just email. A Google account ties together Web services (like their various APIs and analytics), data storage, and also applications.

Some are "business-ending" serious, while others may be relatively frivolous and replaceable (like Calendar).

That said, some of the linkages can make "frivolous" services more important (like using Calendar to link business appointments, documents, and emails).

So, when a Google account gets nuked for a problem in one of the services, they all go into the toilet.