[Someone]

I would think so, in the same way instrument maker or painting maintenance can be careers: not for many, but a decent career for a few aficionados.

It’s not likely to employ millions of people, but there will be demand from people with serious money. For instrument making, research labs will need specialized glass parts, for example; for painting maintenance, museums have a need to keep their centuries-old pieces in the best condition. For watches, if you pay a few million for a watch, paying 10k a year for maintenance should not be a problem. For that money, you can make a decent living of 20 customers a year in many countries.

[WillAdams]

Availability of parts is something of an issue --- couldn't get my father's 27-jewel Seiko repaired for want of parts, and still trying to justify the expense of either salvaging from another watch or paying someone to fabricate a replacement part.