G. Mark’s Answer
Well, you're talking to a biased judge on this. I'd say definitely so. One of the things that many folks have neglected over past decades is learning skills and trades and necessary problem-solving approaches in favor of university degrees. Often those degrees sound nice but don't have practical applications or help get a job. Small engine repair is one of those skills that people will be needing for a long time. You may have been convinced that electric cars and electric motorcycles and solar powered machines will take over, but that won't be for awhile yet. And while we wait for this, there are literally millions of small engines out there that will need to be serviced. And if you know how to fix a small gasoline or diesel engine, you'll have a big head start on fixing just about anything mechanical.
The thing about small engines is that they power a great portion of the entire activity of the industrialized world, so you'll likely never be short of work. And in my experience, they sure are a lot of fun. And their evolution hasn't stopped. And even if you decide not to make a living repairing engines, that skill will pretty much always come in handy.
Another thing is that, as I said, small engine evolution has not stopped. So if you're the person who comes up with some new trick or innovation, you can be pretty sure a lot of people will be interested in it.