Don't you always need to evolve though? Repair won't "end" but it will definitely change. It will be come more specialised meaning the ones keeping up have less competitors.
I've been a programmer for over 15 years now, and have always had to evolve my methods and practices. Even changing languages to stay where the money is. That's part of business.
If you're standing still, you will be left behind in any industry.
Speaking of doing other repairs; I have done repairs on devices I didn't even know existed. Even soldered a bunch of jewellery the other day.