this idea its perfect to reduce the playerbase split among campaings, 2 new campaings that can be played with a mix of armys that we already have in other campaings, maybe we can add some extra lvl to this armys exclusive to this mixed campaing to balance some weakness of some armys. for example:
1.- Italy campaing: tunisia and normandy allys vs tunisia and normandy axis
2.- kurks campaing: moscow and stalingrad allys vs moscow and stalingrad axis
also a option in the menu would be added, in the same way we have the option “join any team”, this option “join any campaing” will send you to a matchmaking that can search for matchs in both campaing, example you are in tunisia allys click on this option and matchmaking can send you to a match in tunisia or a match in italy, a extra 20% exp reward if you have this option aviable will make everybody use it.
the best part if you dont like this you just need to lock this option and play in the campaing you choose, so everybody its happy.