Wrong about what? Saying that one team "can't win" makes zero sense. Many people were saying the Leafs "can't win", those are the people were wrong, simple as that. That's the main premise of the thread, does that help? Sorry if I didn't make it more clear but it seems like it was clear enough for most of the people who have posted ITT.
I haven't noticed anyone over the years saying that the Leafs "can't lose" so when you refer to "those that have been wrong for so many years", I don't know what the heck you're talking about. Feel free to explain yourself though, always happy to listen.