The upcoming update will mainly affect Draconians, as greenscales will be MCU units only, might be cut for a later release and be replaced with more orangescales, mainly inspired by the AoW3 concept art.

In the future, I am planning to rework town structures as shown below.
On some race/class combinations there will only be 1 or 2 levels on the class structure.
These building lines will be cheaper than their original counterparts due to the amount of bonus structures the core line opens and the city bonuses provided by the class line. They are NOT replacements of the original lines nor will they lock you out of the alternatives.

The main reason behind this is to make cities easier to read regardless of class and overall balancing, as having units all over the place makes balancing access tricky. It will also add more flavor to each race and explore their cultures further.