You just have two accounts. But you have that anyway if your company using is Google Apps. I think the assumption that people have a work email and a personal email is generally pretty reasonable.
What's your experience at Google? Do all off you habe 2 accounts and if so, don't you have problems making sure that your not work related friends etc. don connect with the wrong profile?
So I guess the short version is no, what you are concerned about won't happen.
It won't happen for Googlers, but it will happen for G+ business users, since they (afaik) can't make their profile fully private, and it won't be entirely silo'ed.