It is guaranteed to happen. The key question is when is it a problem? We've lost lots of knowledge as a society but we're still going. Some skills decline in usefulness, others gain utility with the passage of time. Tale as old as time.

I would hope as long as there is a demand, there will be those willing to fill it. There never would be a problem because the skill set would stick around as long as there is the need for it. At least that has been the historical trend.

We still have horse farriers for show horses or for family pets. It is a niche there for those that need it, but nowhere near as common a job as it once was. It will likely be like this. Those that like doing it will stick to it, but we will not see Indeed listing jobs for it as much. Of course with less demand, less will have the skills, so those that do have them can definitely command quite the power when they are called on for something.