The era of general-purpose computers won't end.

The problem is that a great many single-purpose items are (and increasingly will be), for reasons of scale/developer availability/familiarity, general-purpose computers that come from the factory supposedly packaged to do only one thing.

But all of them will have brains that will let them do arbitrary things.  Some of these things will be done at the behest of the organizations controlling the society where the developers come from.  Some of them will be done at the behest of transnational organized crime rings.  Some will be done by enthusiasts.  But I don't think we are too far from the world where you can't trust your toothbrush unless you carved it yourself from a stick with a knife that's been in your family for generations.

But really, this is all just "Reflections on Trusting Trust," which was, what, 1984?