We still have tons of people (myself included) who gripe about the loss of Mr Toad, DL's Peoplemover, Imagination v1, Horizons, World of Motion etc. The idea that Splash will be any different is absurd. Splash was also far more popular than any of those other examples too, and there's a vast crowd of younger audiences who will remember it and have access to decent quality recordings of it.
The only thing that would nullify some of this backlash is if Tiana is of similar quality to Splash. Something that has almost zero chances of happening. I don't expect it to come close either. Even IF the desire and budget is there, WDI doesn't have the talent to pull it off.