Could the repartition of Ore fix the market (and the game...)?

I did. And all you need to avoid diamond-rats is not being asleep in front of the screen, wich is not a challenge.

If the supply of minerals pushes the price low enough, fewer people will mine, and the price will go up.

Simple economics will be sufficient to fix the situation.

This is only true in a vacuum. Opportunity costs complicate that theory. As do deliberate starving of certain areas of space, price cartels, etc.

CCP do have to take action at times and of late these actions have almost universally favoured null mining changing the high, low, null, wh balances