This would be my dream UT4.
You start off online with an assault rifle. You play enough to get enough cash to get training to buy something like a rocket launcher, and progress to the next level of deathmatches. The general idea is that
-You play with others the same level as you, initially with limited weapons, so that newbies can learn the weapons propperly, then you buy licenses to use the various game vehichles.
THe point of unlocks is to force new players to learn every weapon and appreciate every vehicle. This should not take long 3 days or a week at most of playing. Then you can be recruited, and paid, to play in team deathmatches and the team captain gets the spoils and has to pay his teammates, so that you have a sort of in game economy. Then you can own tracts of land which you fight over in Warfare rounds, again with two team captains picking teams, paying the players. You could also have leagues and tournaments, and whenever two players from the same league are on a server the same time, they can play out their fixture.
Once you've got enough cash, you can be a captain yourself, and when your turn comes on a server, you can challenge the other team's captain to a game, you pick teams, and fight over ownership of territory.
Add in a mix of custom weapon skins as you progress through levels, and go faster stripes(custom decals) on my manta with custom horns again as I progress, that would be perfect.
Failing the complex economy, just the horns, skins and go faster stripes would be enough.
The first thing I'd have would be endgame stats that gives rewards for the most accurate, most dammage, and whatever else, and that you unlock custom weapon and vehichle skins as you complete various achievements. You also get an in-game rank.
World in Conflict does this very well
http://demo.worldinconflict.com/us/