I think dance soldiers are not viable at all. I dont have any specifics, but I think a tokala (dog) soldier takes 20 sec to spawn with a full CP (25 vils).
Lets assume that by age 4, we have upgraded our vils gathering rate, and we collect stuff by then with 1 resource/second. So by designating 25 vils to CP for 20 second, we are loosing out on 500 resource for a unit that is worth 300 coin.
This is very loosely calculated, didnt have time to test it all out, but I hope the point is clear.