Everybody is always entitled to their opinion, but personally, I'll be really sad if they change the controller too much. The only reason problem I have with the DualShock 3 are the L2 and R2 buttons, and those are fixed with a $5 pair of add-on plastic.
Otherwise, I like the smaller controller size (Xbox 360 controller is a bit big for my hands), far, far prefer the analog sticks being in the same relative physical position, and definitely like the feel of DS3 analog sticks over Microsoft's sticks.
I certainly don't hate the Xbox 360 controller, but the DS3 is my preference. I'd hate to see Sony stray too far from what they've got now.
Being honest though? I'd love to see a future where first-party controllers
like the Mad Catz MLG controller are the norm. Let us swap in and out the style of d-pad and analog sticks, as well as their positioning on the controller. (And really, while we're at it, the placement of the button array as well, for the benefit of left-handed players.)