Look up Free Allegiance, some people kept the old MS Allegiance game going.
I looked up this one. It looks very unique. I remember trying it 2 years ago for a brief time. At the time I had no idea how to play and wrote it off due to having no clue how to play. Reading about it now has me interested again. Does anyone here play this? Seems it has a very steep learning curve and I'm not sure I'd enjoy the journey towards proficiency, given its dated graphics and hardcore player base that will surely claim "pwnership".
I played it pretty heavily when the original game came out, I tried the free version later on but never spent the time to get back into it. It was a fantastic concept that was probably way before it's time. With a coordinated team it was a ridiculous amount of fun with people scouting, flying bombers and escorts and also having to keep a defense organized it was full on battle with command structure and everything.
I imagine trying to get into it now would be tough because, as you said, the people left there are the hardcore that have been playing it for years and will probably shoot you down before you know what is happening.