I think these shader efforts are totally worthwhile. You said it yourself - a hundred or more TV technologies. And all those CRTs are leaving us for the landfills. Why not preserve as many of them as possible in a simulated form so that people can continue to experience them?
Well, even better, when it's working dont throw those that work to landfills, have a perfect retro monitor, with a hard switch button to consume 0 watts when not playing.
