He said he had to shut down his business - couldn't find anyone willing to learn the trade.
He said no one wants to get their hands dirty anymore.
He said it's a shame, they could basically charge as much as they like - write their own tickets.
I'd add basic mechanics to this list -- things like changing my own oil and replacing my own battery have saved me a TON of money and there's a satisfaction that comes from being able to fix your own stuff.
As an aside, my wife and I do home improvement projects 'for fun'. Our largest so far was updating a bathroom. Youtube is amazing for learning, and worst case you end up hiring someone to fix what you broke :)
But I had watched what they did, and nothing seemed that complicated. Ever since, I just do the plumbing repairs myself for a couple bucks instead of several hundred.
Probably for very similar reasons.