My first thought at Google launching any new product/service is:
"Heyy, another neat service that will live for 2-3 years before it gets axed."
TechAltar talks about using it for more than a year here: https://youtu.be/hePnMAL1eh4
Google+ put all its funding into cannibalizing other Google products against the will of those product builders and users, and none into making Google+ desirable.