I think they need to make the controllers have a rechargeble battery, THAT WILL LAST A LONG TIME. Yes it is a huge advantage to have controllers that use regular batteries because as long as you have batteries, you have your controller. But I think it would be better if they were rechargeble, IMO.
One of my controllers is. They last really long, my other would be, but it was a xmas present and my mom had no clue which one to get.
The rechargeable battery things made by Microsoft are a damn rip-off... they are exactly the same as normal rechargeable batteries, yet way more expensive. You can get a pack of 20 rechargeable AA batteries with two chargers (each being able to charge 4-6 batteries simultaneously) for the same price as one of those crappy rechargeable 360 battery packs...