We can point fingers at each other all we want, but at the end of the day, we are all still trying our best. We might have different opinions about Zelda as a character, but to claim that all the Zelda mains just aren't trying hard enough is pretty absurd. I mean, if we weren't trying hard enough with such a character we would switch a LOOOONG time ago.
We probably can all agree that Zelda has problems. LOTS of them. Will ledge cancelling stuff help her? Yes it would, if one is perfect in execution and positioning. Will it make her high tier? Time will tell, but guesses lean to no.
Zelda will never be considered a real threat if she doesn't get any results in offline tourneys. Unless a miracle happens, the amount of time to fully show Zelda's potential is ticking really fast.