The day when AI teaching programs will be the norm is coming very soon. These online schools are just a precursor to what's around the corner. As for "cheap" tech support - there will always be something new. 100 years ago 75% of the people worked on farms now less than 2%. In the 50s and 60s there were huge secretarial pools. Now those are gone. Future technological change will bring new jobs. Morse code came and went. Horse buggies came and went. New skills will always be needed.
Now - there may be a time ( the singualarity and all that) when things may be really different (3d printing, photovoltaic cells providing unlimited cheap energy, nutritious, tasteful, lab grown food). But that's something we can't predict today.