One ring to rule them all... :)
For those worried that more mods will hamper multiplayer, I dont agree. Server operators will have a choice what to put in there missions. That is a good thing. Also, for example, If you own A10 but not BS2, you can still join a server that offers both to fly, You just cant fly BS2.
I think the core system, DCS World and 3rd party mods are brilliant.