Until it doesn't need to be hands on anymore.
For example, TV repairman diddn't go away because it became their jobs were offshored, they went away because TVs crashed in price so that by the time a failure occurred repair was no longer as clearly economic.
Leadwork - using sheets of lead soldered on roofs to waterproof - has largely gone away due to the introduction of fibreglass and membrane films which do the same job vastly more cheaply.
Leaded glasswork - piecing together large panes from small bits of glass went away when techniques for making larger glass came around.
Lath and plaster construction went away when wallboard came in. ...
While there may always be a need for some services to be provided locally - don't assume that the jobs required for that service will remain constant.
For someone beginning their career, and going into building, a clear risk is large scale 3d printing eliminating a large number of the people conventionally employed on a building site.
A large machine that takes a couple of guys a day to set it up on site, and then one babysitter to produce an insulated watertight structure with reinforcement and plumbing/electrical channels already there, eliminating most roofing, bricklaying, cement, ... guys seems entirely likely in the 20 year timescale.