Becoming a truck driver currently doesn't seem a wise choice when self-driving trucks are on the horizon.
First, I disagree with that opinion politically. But that's not the main issue I have with the mindset. There are a HUGE number of business opportunities in the "short-term" 5 to 10 year market. About 15 years ago, when 3d-printing was "about to take off", I know of some entrepreneurs who started a 3d-printer / 3d-CNC Mill sharing service. It was an old-school service. Telephone based, door-to-door, handshakes kinda…
Ehhhh, this is not really true. All (decent) printers operate at similar speeds and qualities these days, the main difference is that cheaper printers require a bit more fiddling and may not be as reliable if you're planning on running it constantly. A $4000 Ultimaker really doesn't perform any better than a $800 i3 Mk3, which in turn is only a bit better than a $400 CR-10.
There are industrial ($100K+) range printers by companies like Stratasys that are really a different class of machine that are dramatically more capable, but universities aren't really operating those and only laboratories with a specific use case buy them. Most universities are running the same sort of printers that consumers are buying, e.g. the one I attended had a fleet of Lulzbots. The appeal of services like you describe is that you don't have to operate the device yourself at all, nor do you need to make an initial investment if you only want one thing printed. Most people don't really have a need for a 3D printer nearly often enough to justify investing even $3-400 nor do they want to learn how to use one, hence there is a nice niche serving their infrequent needs.