This has been thrown out as an idea before.
They straight up ignored it....
I agree though! You'd think this would have been the next step in the Battlefield Franchise.
IMO it would cater for all the imbalanced stomping that happens presently. When you're being stomped by one team, players can simply fight on the other front for some equality instead. Alternatively, both weaker teams may naturally end up fighting the greater team by happenstance. It would be a lot more viable if the map/landscape orchestrated teams meeting in the map center, by which if one team takes it over, both other teams are hitting them in each side - resulting in a valid free-for-all where even a weaker team can win by a lucky coordinated play at the end - exciting for everybody!
