My point was as Air Suspension becomes more prevalent, there will be economies of scale and competition. That will eventually drive down costs to fix or replace... even the cost of the option itself over time.
Think of it this way: lets say RAM sells 500,000 5th gen's per year and the take rate on Air Suspension is only 10%. That means there are 50,000 potential replacement customers per year. Over 5 years, and times 4 corners of each truck, that's potentially 1 million components to make and sell... hell of a profit motive there. And that's just RAM... now add Jeep, Tesla, Lincoln, BMW, Range Rover/Land Rover, Mercedes, etc. It's the same with any technology... as adoption rates go up, production costs go down. It may take time, but it will.
I think your point about harsh conditions in Canada is well founded. I'm not discounting that, what so ever. My supposition is that the product will/has improved, and resolving issues will as well.