Stabilizing populations 

Is it possible (and would it be wise) to have components, end products and civil services have a decreasing effect on population growth based on the population at a city?

For example - Since components only start climbing at 2 Mil, could they also start of with say only a 50% effect on the population at 2 Mil, rising to 100% at 4 Mil. Likewise with End products having 50% effect at 3Mil up to 100% at 6 Mil and Civil services at 5 and 10 Mil. On the flipside, once a city drops below 2.5Mil (half of 5), Civil services would have 0 effect on population decline. Likewise with End products at 1.5 and Components at 1.

This would mean that, during growth they are less important, and also importantly in a crashing city, they eventually become less important. A city with 1 mill population thats still declining hard because there isnt enough Adult Toys is a bit silly.
A city could still crash without the raw materials, but it makes it a whole lot easier to save a city, and stabilizes the growth of a city without affecting the actual end population or profits.
edited by Rekkles on 9/3/2017

That would be tricky, Already if the population is low, the end products go up very slowly and will not exceed 200. And when the population falls below 5 mil again, the demand on end products starts to fall , not increase until it hits 200.