Classics are just that. ... do people get more from Small World or Mission Space? Mansion or Little Mermaid? Peter Pan or Primeval Whirl? ... And TDO has removed other newer classics (Imagination, Horizons for two examples) for crappy replacements. Imagination has eaten up so many tens of millions of dollars for two re-dos and there are plans (possible right now) for another because they sucked so badly (no, of course no fanboi/Imagineer jokes here ... never!)
The Birdies will never be one of the most popular attractions, but that doesn't mean they are ready for retirement either.
For me, personally, it means a lot because my grandmother was very ill her final three years on Earth. And it was during this time that she made her only two visits to WDW. The first was about a year before EPCOT opened and she absolutely loved the Tropical Serenade and singing with the tiki room denizens. If I close my eyes, I can picture it. I still like it more in Anaheim ... and find the whole fanboi lovefest with the Orange Bird over the last half dozen years to be very, very odd though.