Seige could have been developed more but the really cool things that could have happened (like huge battles of bots with the players playing as heros - Geonosis
) couldn't happen because the engine lags badly after so many npcs.
I recon an advancement of JKA (like JK4) should make it easier to play in large arenas like in battlefront. A combination of JKA saber and gun controls with battlefront map sizes...