Advanced Maintenance needs for scaling the industry

In my opinion, the maintenance mechanic is very good and should not be removed by my following suggestion. But I would like to see that there is a more advanced need to keep the industry running since in today’s economies a lot of effort is just needed for keeping itself running.

Maybe an additional mechanic such as „Upkeep“ could be introduced which consumes a percentage of the building cost every month/year/decade. Therefore, it would be more of a balance act to sustain an even bigger industry.

To argue on behalf of keeping both mechanics in the game. Maintenance could be seen as a short term requirement for daily purposes - like regular service - while Upkeep could be the long term equivalent which covers obsolescence or replacement - like the new procurement of a machine at the end of the machines lifespan.