Right now 4 v 8(12) missions takes about 30min. An 8 v 16(24) mission will more than double that. This isn't 1hr of playing co-op with a friend but spending 3/4 of a mission sitting and waiting for the AI and your friend to finish their moves.
A system were you only control a pair of mechs might be workable but 4 mech each wouldn't appeal to any but the most hardcore BT with a LOT of time on their hands.
One of the biggest challenges HBS still needs to meet is speeding up the pace of combat in the base game. Modding the sound .jsons to reduce the absurd camera lag durations helps, and cuts several seconds PER MECH off the combat turn (even with all the cool animation sliders off), but I know there's more to do. If I had video skills, I could shoot two minutes of combat video and point out at least 40 seconds of wasted player time. This is a bigger deal than HBS seems to realize when it comes to fun, time, and getting people to keep playing the game (and thus buy DLCs).
And the Clans. Oh boy, I don't think anyone in HBS want to touch that balancing nightmare until at least BT3. Either you curb stomp AI as clans or only fight one clan mech at a time with your meager lance of peasant IS mechs.
There's no need for BT2 or BT3. Once sped up, the current engine handles everything needed. I would be
very unhappy if I was asked to pay for BT2 three years from now on top of BT1 and 3 DLCs. Just make it another DLC for the existing engine.
Balancing factors for Clans:
-Reduce their weapon damage to match IS levels (note: Also nerf all the ++ and +++ weapons - small lasers should not hit harder than mediums, the amount of bonus is unneccessary). No more 35 damage ER mediums or 75 damage ER PPCs.
-Go with Lore armor levels (Hellbringer, Jenner IIC, and others dangerously thin-skinned, etc.).
-BT does not have much of a long range game right now due to absurdly short vision and sensor ranges. We'll be in weapon range before the Clanners have LOS on most maps.
-We won't be up in the FRR during the first waves...coming from the Rimward Periphery, we'll have time to know what we're getting in to. Expect to have two IS lances vs a single star unless we're on the back foot.