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Only one thing: a brand new engine...

What would that accomplish? The gameplay dynamics would be different, it'd be hard finding enough developers to devote to the game for free and it would take quite a while.

I know what a new engine would mean but I'm asking you what it would accomplish for this game. The entire thing would have to be redone from the ground up and then anything resembling America's Army would have to be stripped as that's a much larger step towards copyright infringement than where we currently are now.

Those that are good with creating content either have jobs in the field and have very little if no time for FREE work or they are on other games. The big modding community for UT exists because they like that game. They don't come here because this is a serious game with core values that shouldn't be disrupted.

Even if we overcome the monstrous hurdles of finding a new free engine, finding developers willing to work for free, and then can collaborate everything together, there still remains 1 problem:
If the AA devs couldn't rebuild the game (AA3, AA:PG) and keep the core AA2 players, what chance do we have? The gameplay would be different.

...what it would accomplish for this game...

In these days, the image quality is what people like. In this case AA3 is not too bad - only gameplay sucks. Imagine AA3 with AA2.5 gameplay... Rewriting AA3 will be much easier than to move the entire AA2.5 to the new engine (where I'll suggest to use AA3 content any way...).
Biggest problem of this community is Linux support, if not, UDK is free - as long as you don't make money you don't need to worry about copyright. Eliz already has proved, that porting AA3 (maps) to UDK can be done very easily thanks to the large similarity.

The entire thing would have to be redone from the ground up

Not really...

Those that are good with creating content either have jobs in the field and have very little if no time for FREE work or they are on other games.

Better ad should do the job in finding the right people.

The big modding community for UT exists because they like that game.

...because of flexibility of the gameplay and engine accessibility - here, this is not the case.

If the AA devs couldn't rebuild the game (AA3, AA:PG) and keep the core AA2 players, what chance do we have? The gameplay would be different.

True, but I think it would be worthwhile to try.