DCS is the best combat simulation on the market and will become even better once F-18 gets released. It's fair to say that nothing comes even close to the experience you get with the A-10C module.
Nothing is perfect and neither is DCS. There are quite a few things that can be improved such as performance, maps, modules, etc. Hopefully EDGE and 2.0 bring those changes. The main problem with DCS is like others have pointed out is the empty world feeling. Sure flying studysim modules is an amazing experience but it gets boring without any kind of decent multiplayer experience. Take a look at Falcon and its campaign. You can invite people and it will never get boring because no mission is ever the same which basically offers you endless replayability. This is the single biggest thing that DCS is missing.
Those in charge at ED need to utilize Kickstarter more. We've seen what an amazing support games got that were not even in development yet. DCS is already established as one of the best flight sims out there so people wouldn't hesitate to pledge. Make a KS campaign for campaign module and even new combat theatres so you can hire more developers specifically for those two things. I can assure you many people will back you up without hesitation. Me included.
Your vision for the game to include massive Air, Sea and Ground battles is admirable however I don't think it's possible with the current tech. A couple of years down the line when the game matures and new tech becomes available I can see it becoming a reality with hundreds of people on one server fighting for objectives. But for now a better investment would be to look at creating a dynamic experience.
