You vastly overestimate the number balanced maps we have, and also the fact that we have Allied vs. Axis every game which complicates things and necessitates utmost balance.
Just look at SC2 maps and notice how similar they all are and how symmetrical they all are, now if we had maps like THAT in CoH2 sure... let's go crazy but that isn't the case.
CoH maps take a huge amount of work to balance and justify due to the ALlied vs Axis dynamic, garrison mechanics, and the complex resources/capping system.
And because of this we have to be very, very, careful about messing with maps too much.
That said relative to our game I/we are open to more maps in teh 1v1 tourney map pool with:
Langreskaya probably returning
Nexus under a lot of work right now to make it tourney ready.
Vilashanka well thought of (if the bugs can be fixed)
So that's some which could be used already.