I don't see a lot of people still writing with quills, and there's a reason for that, yet there have been no catastrophic consequences, excepting maybe for "Big Quill". Personally, I think this veers into hyperbole a bit. The degradation in motor skills is barely measurable when compared to common tasks required of people today and we're talking about a skill that has less and less use cases every day. I believe this…
If you don't want to be replaced by machine you need a skill which machine can't replicate and train that skill somehow. Or become a very good machine operator.
For that matters, pens are a type of machine. if you use a pen you are a machine operator.