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I think the real long term issue with CIS is that the parts will become harder to find and more expensive to replace. There are only a handful of shops or people left who still rebuild WURs and fuel distributors. Once those experts retire or stop doing the work, people like myself will eventually have to convert to carbs or fuel injection just to keep these cars on the road. Even if you have the skills and knowledge, the parts simply will not be available at an economical scale.
Tony mentioned it took him close to five attempts to get my fuel distributor dialed in correctly using different shim combinations. That tells you how precise and specialized the work is. And that level of expertise is getting rare.
Carbs are heading in the same direction. It is becoming harder to find people who know how to rebuild them well, and locating quality parts is not getting any easier either. In another five years I think modern fuel injection will end up being the most common option for people looking to upgrade or simply keep their cars running reliably.
Just my two cents based on research, talking with people, and trying to diagnose what was going on with my own car.
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