Everyone is just in BF1 right now because of the dlc, happened with Hardline way back when. A couple of us do try and play 4, but with the LAN and the seeders offline during that time, it's kind of sucked trying to fill a server by yourself, especially when everyone is either in BF1 or ARK.
I'd say try cutting a few bf4 and make them BF1 if that's where everyone is going to be for now, everyone seems to be playing on random servers and notthe the single ATR one we have (may be because it is just one vanilla conquest type stuff, not new game modes), may just die until another dlc l