Now, I know that eventually this kind of implant will be made; and that SOMEONE will get them; the big question is whether it would actually spread beyond the "biomod" weirdoes who get forked tongues, masses of piercings, etc etc and to society as a whole.
Speaking as someone who has undergone head surgery in his life twice for an implant....the risks are definitely non trivial -- after I had my second implant, everything tasted like cardboard for several days afterwards.
And that was for a simple implant where you simply place an electrode into a cochlear to stimulate it. What happens when you are placing them into the BRAIN of all places, or along the optic nerve?

There was one Science Fiction Series I read; I think it was the Genellan Series by Scott Gier, which actually addressed the very real risk of this kind of cybernetic integration -- we have enough problems these days with internet viruses etc messing up our computers. So what happens when the computer in question that's being messed up is interfaced directly to your wetware?
In the Genellan Series; some Scientific types actually got cybernetic implants, and this fad lasted only as long as it took for some bitter hacker who hated college professors to put together a Joker virus that infected the implants of the professors and stimulated the part of the brain that made you laugh -- and so the professors laughed themselves to death via spasm... and then nobody wanted implants anymore.
I mean, can you imagine hearing an ad for Sex Spam, or seeing Sex Spam in your vision near continuously after your cyberimplant got infected with a Trojan?