With Wind Waker, if there had been a hero things could have went differently so his threat to the land falls back again to what Zelda in OoT did. The Downfall Timeline is out of anyones hands, but overall isn't too bad because a Hero always rises up to face Ganon. Twilight Princess is an entirely pointless event overall that could have never been an issue if Zelda had never sent Link back in time; the same thing applies to Wind Waker, it didn't have to happen.Nothing Link and Zelda do ever seems to completely destroy Ganondorf for good. The guy is walking 'deus ex machina' who just keeps coming back to life or defying the established rules regardless of what they do. The Triforce of Power coming to save him in TP's backstory was an example of that lunacy. We know from LTTP and WW that sealing him only 'delayed and burdened a different generation' as well. Zelda had no way of knowing every single possibility that Ganon can exploit, no one could.