I would release another 2 map pack for free but financed by releasing a paid for DLC containing 2 more full outfits, 4 new ablilities and 2 new gun attachments and 2 gun skins and a free gaming weekend with the game cut to half the price it is now straight after.
Get the balance patch out of the way first.
Keep the game updated, keep the fans updated and slowly cut the price of the game with a virtual giveaway in the Christmas sale.
Keep churning out maps til the Ark is finished then pump out skins with a small crew keeping the game updated.
Keep Brink in the eye of the internet media with stories saying look at all the shiny in Brink naow!
Watch the slow money turn into a torrent, the players keep playing a game they have invested in and everyone wins.
Splash then buy out Bethseda and go onto world domination.
Whole wars are fought using only Brink and then a mad Texan sells everyone out to the Commie dogs (Robot Jox).
WOLVERINES!