Louis Rossmann and others have proven there is a growing demand for electronics repair shops. The old ones have faded into obscurity, due to the fact they were all focused on older technology. Some did try to adapt, but the modern paradigm has everybody convinced you can't fix anything, so these businesses had the skills, but the customers dried up. They just didn't know any better and the shops/techs weren't used to doing any kind of marketing.
The old repair guys didn't advertise because they didn't need to. Like an auto garage, they were always backlogged. But these days, people need to be told that they have options to repair things.
I think there's demand there, but half the problem is the consumer isn't aware of it.
The TV fix is perfect example. Most of those failures are the usual. And people are cheap...they'll always go with the bottom line, but how many people know that there couple year old TV was just built with cheap parts and a quick refurb will make things like new?
They don't know, as also mentioned in the post and example above.
The key is to connect the techs with the general public. They need to know that their devices are repairable and there are people qualified to do it. A part of the problem is people like Louis and the like are preaching to the choir. They're trying, but it probably needs to be the whole tech community teaching the wider public better choices.