Do BG's need diminishing returns?

As we all know, with the changes to Alterac Valley in patch 2.3 have come changes to the tactical balance of the game. Specifically, if you're not willing to put some real effort into defense, you're not going to win, and you can end up in a turtle game waiting for one side to run out of reinforcements. Which leads me to wonder: if the games are inherently limited by the reinforcement factor... if by killing opposing players you will eventually win the game and as result there's no way the games can last indefinitely... then what do we need diminishing returns on honor for? Battlegrounds are limited in that you have no real choice but to kill the same people over and over again, after all.

There's never going to be a setup where one side agrees to be honor famed by the other in AV now, if that ever happened in the first place. One side is going to lose, the game is going to end, and a new game start up: but if you've played in a lot of AV's lately where one side put up a vigorous defense and the two factions clashed for a significant melee, then you may have noticed as I have that your estimated honor for the day will often be wildly overstated. For instance, yesterday I managed to squeeze about 4k honor out. But when I went to bed, it said I had almost 6k honor estimated. I understand what estimated means, that it's not accurate, but the idea that the system estimated an additional 2k honor over what I had actually earned made me wonder if there was a way to improve this. With Arena 3 coming out tomorrow, people have either acquired the honor they want or will be working to do so, so it seems like a good time to consider if we need what seems to be an outdated means of preventing repeated ganking or honor farming.

Then again, I suppose you could do it in Warsong still. AB and EoTS also have their limiting factors built in, but Warsong keeps going until someone caps 3 flags. Maybe we could just eliminate the honor decay in the other three BG's? That might make Warsong drop in popularity, though.

What do you think? Do we need diminishing returns on honor in battlegrounds?