Even so, with a smallish population of users and the spammers still figuring out how to operate, G+ has some serious usability problems (like you can only see 2-3 items in your stream at a time on a high resolution display) and it's already getting kind of spammy. In to succeed, Google needs to maintain laser-like focus of usability and continue to innovate on a small number of features -- it can't just glom random stuff onto it or integrate random GoogleLabs projects.
For those whom Google Docs is a suitable replacement for Sharepoint, I doubt integrating G+ will make a huge difference. For those for whom Google Docs is inadequate, G+ won't tip the balance. If G+ takes the proposed approach it will actually alienate many potential users. It's better to embrace the outside world than replace it. (And, in fact, it contradicts the "blue ocean" strategy.)
Frankly, from a big picture strategic viewpoint, it's great to see Google annihilating Facebook, but it's fiddling while China burns. It's losing search, and no-one in China aspires to own an Android phone -- they're saving up to buy iPhones and using non-Google Android phones while they wait.