Just venturing a guess here but chances are, resetting the infrastructure of present maps, from 3 to 2 sides would require a sizable modification of coding. My next guess is that Dale is/has/will be moving on to new pastures given the updates we've seen in the past year or so.
He can code it to disable one side and offset that with ENY adjustments for the remaining two.
It’s not an insurmountable hurdle.
Frankly, he’s made a lifetime of money off this game as it is. He could close it down tomorrow and not miss it.
We already have two sides with the added benefit of pissing off a third of the players on a daily basis due to their inability to find a fight...
Player retention.
Fewer bases.
Two sides.
Any of these three things would be a massive help.