[Rich in Vancouver]

We are very lucky that MGR collapsed while our cars were still in full production. The factory pipelines and dealerships were stocked with parts, many of which are still available today. We are also lucky that Caterpillar has kept X-Part going and producing parts for our cars.
I agree that the day will come when X-Part will be uneconomical to run and parts availability will be in a lot worse situation. Some small suppliers will take up the slack and hopefully outfits like Dayco, Delphi and Tazu will find it worthwhile to produce critical parts. As mentioned before it will likely be the electronics that finally put paid to our cars, but who knows? Maybe an electronics supplier will come up with a plug and play solution to replace ECUs and other electronic gizmos that keep cars (Not just ours!) running. One day we may be able to plug an I-phone into the dash and it will have an app to run the car. Or we will all end up driving electric appliances.
Regardless, if MGR was still around they wouldn't be too keen on keeping our 15yo plus cars running. That would be bad for new car sales.