Remove lowbie towers. Make all towerfields lvl 175 minimum. This will make another incentive for lvling and a lot of problems for new players go away. No more groups of new players being wiped out by a single guy when trying to take a towerfield. Much less exponation of the balance issues that run rampant at lower than TL7 pvp.
Overall a much better implementation than currently. Also, the number of towersites should be reduced to accomodate the lower number of players currently in the game, making the highend towersites that much more attractive.