Unfortunately (or fortunately, depending on your point of view) both Daisy's and Zelda's run to the finals will pretty much kill any discussion on making the final smash meter legal in competitive play. I rewatched all of it last night to figure out what made Zelda so much better this time around, and really, both Daisy and Zelda benefited enormously from their FSes. Zelda's is unblockable, has a ridiculous range and poofs a character out of existence after like 80%, and Daisy's takes over the screen-- abusable when a character's offstage to ruin their recovery-- and heals her, giving her a huge advantage swing. Just look at the difference between Daisy and Rosalina in their match. Daisy's FS was a huge benefit. Rosalina's wasn't even threatening.
With that large of a disparity between characters' FSes, I seriously doubt they'll be tourney legal at all. Shame.