One thing you do forget, a lot of people are already PS+ members because they saw the value of it and will continue simply because of that. I am in that group. I think paying to be able to play multiplayer is absolute bullshit, though I almost never play my console games online either. I'll continue my PS+ membership not because of multiplayer as I wont use that much at all probably but because all everything is PS+ has been and will continue to offer.
A lot of people sub to PS+ already due to the tremendous value it offered and I bet they continue for that sole reason alone even if multiplayer wasn't put behind that paywall. It is BS like I said it is now behind a paywall.
But guess what, this is one of the things those of us were trying to explain to people saying they are buying the X1 and its DRM/Online/Used games crap. If people show they are willing to put up with shit, eventually others will follow foot and do the same thing making it standard and screwing everyone over. Sony watched MS do it for years with Live Gold and how people lapped it up like it was so amazing thing, now Sony has followed and is charging for multiplayer too.
What do you think is honestly going to happen next gen if they see the used games/online drm become widely accepted? This is what a lot of us were talking about as a stepping stone but too many of you want to stick your fingers in your ears and go I don't care its my money nanabooboo.