While everything is speculation, in a conversation with my guide about future possibilities (Grand Floridian/Poly) - she explicity stated the South Wing of Contemporary as being "before" anything else.
I think the long term view of the property would lend to the idea of two curved towers around the A-frame hotel.
While today, everyone is down on the economy, 2 years ago they were all gung-ho. Recent history is that DVC will continue to sell. When the dollar is strong and the US economy is good - Americans buy. When the dollar is weak, International visitors buy. I'd be more concerned about Hawaii and GCV than Contemporary not selling. Luckily GCV is VERY small.
But the Magic 8 ball says "Yes, the South Wing will be torn down and a 2nd curved tower built BEFORE the GF and/or Poly have DVC rooms built"