Part 1: Addressing the endgame and possibilities.
Firstly, if I had everything unlocked, what would be my incentive to keep playing? Fun is why I would keep playing but for others I understand that having a goal to progress towards is a major incentive.
As the game currently stands, there is no indefinite solution to the endgame incentive outside of enjoying your fully equipped squads, not having to level up your ~50mm mortar squad and coming back every 90 days to grind the battle-pass. Not only that, but any way of being able to unlock something you don’t have such as gold weapons or premium squads would be a horrible decision as it would undermine the incentive to use or purchase said premium content. Unfortunately, those event squads/premium/gold content are the only things in the game worth grinding for. We would also be back at square one if all things in the game currently could be unlocked through sheer gamer grind-power.
So, I can only propose the suggestion that something, that can not be bought by money and can only be obtained through playing the game should be implemented that takes a reasonable amount of effort to obtain and doesn’t cause power-creep nor historic tomfoolery. If I were to give a suggestion for the proposed suggestion, cosmetics, vehicles and other simple to implement items by the developer as any game would require upwards of a buttload of content so players never have that definitive feeling of completion. Just out of good principle, do allow for folks to choose what they want though.
Part 2: Yet another unrealistic suggestion.
As for a more permanent solution for the endgame that would require more of the developers limited time. I would suggest a weekly event that players can contribute “faction resources” to play in. These faction resources are acquired through playing the game normally and are reset every week. Faction resources are then used to spawn any squads or vehicles you have unlocked in a weekly conflict map. As for how large such a map should be, how detailed or what the objectives and rewards are I will leave it up to you to discuss. A player shouldn’t be locked to one faction as that would cause everyone to join the winning side at the end of the week. Objectives should be the main goal for players and the game should persist and be joinable at any point in the week. Good luck figuring out spawning and deployment.
Which begs the question, would the game even be able to handle such a continuous and large scale event? It would be cool to use a planes landing gear for once outside of the pacific campaign. It would also be cool to fight a tiger 2 over long distances. Heck, it would be cool if I could just drive in a straight line with a resupply truck, BT-7 or just in general. I would also like it if balance was strictly limited to the nations presently in the weekly conflict and resource points. I like the underdog aspects of the game and good attack pilots tend to make short work of any tank.
Thank you for your time and have fun.