Wow...crazy thread.
One of usual reasons why a character has a chance is that either A) They've had their own game, or B) They play a major role in the series.
He does both now. Other than Majora's Mask, you can't beat the other Zelda games without him(not counting FSA since it's just a remake of the original Four Swords, but anyway), meaning he is a major character.
Amongst the actual major characters in the Zelda series, you've got Link, Ganon, Zelda, Ganondorf, Vaati, Shadow Link, and Tingle. They actually are the major characters.(Sheik's 1 game appearance doesn't make her a major character, regardless) Some could also say Impa, but three games with varying personalities doesn't work.
Do I want Tingle in this game? Not really, but to say he'd be a terrible character to add is just stupidity.(and some opinions) If anything, all I can think of is lack of moves, no more, no less. Seriously, people, just because you don't like the character doesn't make them terrible. Bashing is just stupid.