No, silly. They already confirmed trophies are still around in the very same update.
Stickers are easier to get a hold of than trophies.
To me, this doesn't say, "There are more stickers here than trophies in Melee, so that automatically makes them better! No trophies for you, olooololoolololololoooo!" Instead it says "This is a gimmick we threw into Brawl because it requires almost no effort. Have fun with it anyway." Nothing you couldn't do with Internet access and MS Paint...
Edit: Unless a sticker could fall into your eye and force your character to go insane and fall off the edge in agony, stickers can appear in normal brawls and I won't mind (I doubt they would appear in plain multiplayer at all). It's when a bomb suddenly drops from above the ground right where I'm standing as I'm about to launch my final attack and kills me, or when I'm waiting to attack and a fan appears, and I pick it up by mistake and don't attack. Sure, items have even chances of giving me an unfair advantage too, but what if I don't want that possibility?