I don't like the upgrade to cannons. Archers and cannons have different purpose in the game. The first are ment for battlefield, cannons for siege. Their ballistic shooting is all, they have in common.
Machine Gunners do no balistic shooting!
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Once mortar troops (industrial age) were proposed and I like this idea very much.
I feel, that a long time gap between Crossbows and mortar is quite interesting. It creates a strategic choice: should I keep my highly promoted crosbowmen and pay lots of money while they are not very usefull? Or shall I didband them and build new troops later?
For future area I would like to see some "nano-war engineers" with higher damage against modern tanks and GDR (or even all hightech units), but a malus against (now obsolete) infantery. They should have access to the +1 range promotion (get rid of this one for achers and crosbowmen!) and *maybe* a bonus against citys, too.