I think that's a bit too far out there. RTS battles are just far too dependent on being able to produce units for this to be much fun.
While I understand that it is far too late to change the concept of the RTS battles in DC, I have to agree with meme that RTS battles can also be very interesting without producing any troops at all.
One example I think of is Lords of Magic (quite an old title). In this game, there was also the strategic turn-based part and the battles were fought in real-time. You had only your troops which you brought to the battle field. The main challenge during RTS phase was to position and employ your units strategically, i.e., attack, retreat, use the landscape to your advantage, cast spells at the right time etc. So, a single hero could take down the whole enemy army if you planned your actions wisely.
I also think that no-unit-production during RTS would be in line with Larian's wish to emphasize the leader qualities of the player. Bring only a small army to the battlefield - and you can nevertheless win the battle if you strategically employ your troops and their skills.
