Ok, seriously now, I think his voice in the SMBSS was fine. I wish they could hire that person to do Toad's voice in the games, but I'm not unhappy with Toad's voice in the games (except for Mario Party 4. It was kind of creepy then..)
Besides, if they changed Toad's voice actor, it wouldn't be the same person who voices Peppy Hare, thus rendering Barrel Roll quotes with Toad's voice useless (not that there are that many anyway)..