I have been on the receiving end of a wizard beat down, and also stood against and defeated them as well. There is nothing wrong with wizards.
The problem is they take people out of their comfort zones and that freaks folks out. Okay so you want to turtle up in your keep with standard troops, I want to crack that turtles shell and eat its meat. It's a pvp game with the option to not fight, so don't fight them.
So your pride keeps you from clicking "pay off", that is not the devs problem it's yours.
Fiinally for the devs, dragons have dragonslayers so wizards could have...wizardslayers. The whole mess resolved with a single unit.
Preferably a lone mounted warrior to run them down or a speed boost to a solo warrior type designed to kill wizards. High elemental resists with low s/b/p resist caps so it wouldn't be able to handle wizards but need to be escorted.
Then again this may be too silly, but so would nerfing the focus of the "Arcana" expansion. Arcana is referring to the arcane which in turn is magic which is used by...wizards. So you expanded and then beat the purpose of the expansion with the nerf bat?
I love this game so far, just work out the bugs then deal with the "That's not fair" crowd. Hell,one of the things that keep me playing is holding off Konstantin with opposing conventional armies. No magic at all and it was epic. I still wonder if it was "the" Konstantin or if it was him that he held back, but I digress.
In summation; leave wizards alone and/or make a wizard slayer. Great game, that is all.