Well I mean for one thing it won't be mandatory if it ever even comes out, in fact it will almost certainly be wildly unaffordable for the vast majority of people.

I also don't see it becoming popular or widespread unless they very quickly reach the absolute limit of the technology's potential, because having something in your brain that will be obsolete in a year when they come out with a new model sounds like a bad idea.

In fact I don't think a profit driven business could ever successfully roll out this kind of tech, it would have to be like in certain sci-fi shows where their technology seems to just be the same everywhere without any branding or anything and when there's an infrequent upgrade everything everywhere gets upgraded.

Maybe if it was like an equal partnership between all the major tech corporations so that it was cross compatible with everything and then sold for no profit as a sort of loss leader because then people would buy the other stuff that it's compatible with. I don't know, I just don't see this becoming widespread anytime soon and probably not a mark of the beast scenario.