You are the type of person that was Born as an only child. You we given candy since RoS launch and now that it is slowing down on content creation you think this game is dead. Hate to break it to you but every season doesn't need new content. RoS is a whole is technically complete. Most classes got balanced.
If blizzard continues to release new content well then there is zero point of a final expansion. The slow down is a good sign for a 2017 expansion. Moldran had a video on YouTube stating that D3 would have at least 2 expansions before D4 would ever be conceived. People want D4, which is stupid. WoW engine is more dated than D3. Plus you pull in more sales from DLC / expansions than a brand new game.