Is it possible to disable Google+ and only enable Gmail features basically includes email and chat only functions? Certain instances may cause Google+ as a mere distraction, knowing that by default Google's embedding G+ links and notifications to Gmail. This may trigger the attention of a user particularly an employee who's in the middle of work to check their Google+ status and updates and get distracted most probably 10 -15 minutes, and worst if he/she lets the time flies.
Consider the case: You're opening you're gmail to check an important reply from your boss or from your client. You're beginning to read your emails and suddenly, "the bell rings" - new gmail notification alert! The moment you start clicking that bait, you probably indulge yourself in Google+ and forgetting everything important that needs to be accomplished that day.
This is applicable to a "Gmail-centered" company, be it a starter company or a medium scale businesses.
I'm out of grammar, hopefully, this is clear enough.