While I appreciate a certain level of "realism" in A:2089 or any military based game and I do also check out a little bit of real-world info on the use and formation of mixed units I'm still grounded by an often left by the wayside fact... It's a Game!
With that in mind, getting hyper-critical of the rules for not matching the near-limitless real-world applications of military hardware, scenarios, FF, early 21st century rules of engagement, tactics etc seems a little pointless to me. Sure for gun-fondlers in the real world it might give them a sense of pride to know that in their weekend game they exhibit tactics that would make their commanders proud, but for the average joe/joelle they're just happy knowing that they've managed to blow up some enemy tokomaks and come out of it with a few scratches, earnt themselves some serious Euro's and had a good time eating cheetos and drinking soda.
To answer the original post and posit some possible expansion scenarios I'm thinking firstly the mini's game (after Starship Troopers and the Fantasy mini game is produced)..after that who knows.. So far all the posited suggestions seem a little I don't know, pointless IMHO... Regional expansions? More mek manufacturers? More mek designs? More adventures?