Wind of Change

In this context, balancing the schools of magic seems promising (maybe we'll see damage dealers in water someday? :o)

Damage dealers in water are the most absurd magical change imaginable. (Only in Earth would it be even more absurd.) Damage dealers in water would make water overpowered, while air would become completely useless.
If we disregard damage dealers, then Water is much stronger than Air. So why is a damage dealer needed specifically in Water?

Added 23 minutes later

I think it's gonna change a lot. Instead of buying an art merchant to get more resources, you have to spend more money on a university. Usually, a Conflux doesn't need to build any army in town.

Yes, more gold = more value. If you have no gold, you have no support.

What is your solution? Making the university a more random building could be detrimental to the Conflux's value.

I have no solution. Maybe buy only one skill for the university. For example, if you buy Earth once, you can't buy Earth in that town anymore.