there is a definite spin to the article - not like slashdot.(!)
I like G+ as well, but just don't see how it ever reaches critical mass, and even if it does, will it supplant facebook, or will it just become as annoying as facebook.
I use 3 social media sites, and feel the all fulfill a certain niche, and not sure that will change for a while.
Facebook, for semi-interesting mix of updates from a variety of friends and acquaintances, just dip in now and again when I'm bored, certainly don't feel I'm missing out on anything if I don't check.
G+ fulfills more of my tech need, as I most of the stuff I follow in there is more tech related, and I tend to check it every day, and usually get some interesting reading out of it. (though had to unfollow NASA, they provide way too many updates if they had been landing somebody on Mars, let alone just updates about the effects of micro gravity on small screws).
Twitter is good for when I'm on the toilet and doing a dump.