I hope it won’t be mandatory!
Eventually it will.
Read the descriptions of the “Mark of the Beast”: it will be something you get that you can’t repent of getting (all the worries about subcutaneous RFID chips are silly — anyone with the force of will to take a pen-knife to their own flesh can repent of getting one of those) implanted neural interfaces will eventually have the ability to make you unable to will to get rid of the thing, much less be able to do it.