I wouldn't say its dead, but I wouldn't really say its gotten better over time. We still don't have smooth coasters, ORP still hasn't been added, there's tons of stuff people have asked for since Alpha and it still hasn't been added (half walls) and everyone asked for the Schwarzkopf coaster, but not at any point did they ask for it as a DLC, they asked for it because it was the first looping coaster you could build in previous games.
I said to somebody yesterday, when you develop a game, the best thing to do is OUTDO your previous product, and compared to the previous product, RCT3 had a lot more content/themes/items to use, the Worlds Shop DLC was really disappointing, it had 2 windows in the whole pack and 3 pieces of japanese scenery, that were all themed to the Haya Sushi. I joked a little while back and said "Smooth Coasters Pack, coming soon, £7.99" but honestly... that wouldn't surprise me at this point.