What would be more likely is a "people only" Facebook clone.
The more a particular company or service (or musician for that matter) deviates from the original product that attracted its user base in the first place, the greater its susceptibility to clones becomes.
I think all people want is simple and private social networking among their friends.
Facebook no longer offers this. Google+ certainly never did. There is a strong case that Myspace fell because at the time, Facebook offered more simplicity and more privacy.