I first learned this important law from my late father. In the 1960s he ran a TV repair shop called TowerTV. He got out of the business in 1973 for personal reasons, but it turned out his market timing was excellent. TV repair quickly disappeared as chip technology made TVs more reliable. (This picture, believe it or not, was taken when my dad was 65. He passed away in 1999.)
And anyone who got into repair soon found that the same forces would work faster-and-faster as they moved up-market. Fact is it's now more expensive to repair a consumer video camera or PC than it is to just replace it.
That's what people do now. Lots of niches, like the one occupied by my friend Alex Randall back in the day, have virtually disappeared, and the biggest problem with the electronics industry today is its environmental impact -- pollution on the front-end, landfills on the back end.
Support, training, some help here? Fuhgetaboutit.