There can be different kinds of tanks, walker and aircraft- who said anything about one unit? You have not stated a single adequate reason that would mandate the necessary implementation of infantry. From what can be seen in the few gameplay videos infantry would have to be pretty damn small, and as I have repeatedly said infantry would require more detail and work to look just right than vehicles and especially if they have not yet been implemented. The budget costs would be a waste when, as I speculated earlier, upgrading available units with your tactics and stratagems would very well accomplish the same thing as introducing a new unit type.
I honestly don't know what we are arguing about anymore, the game can subsist well enough without the introduction of infantry (in fact I think it would look better). If the developers want to field an rts based solely on vehicular and ship combat (with a dragon thrown in) then that is their prerogative.
