A lot of the old players I have spoken to have said they would return for the next expansion if Jeff Kaplan was moved from Overwatch to help drive end game content decisions. Under Jeff Kaplans reign as end game lead designer the game saw it's most explosive growth and many felt the reward vs effort system and depth of the game was far superior to what we have now.
Here was an interview for people who don't know him.
https://www.youtube.com/watch?v=41w3zsE77cg
EDIT:
I found this video released on 8th Jan, I recommend watching the entire thing as it's pretty much how I feel the game has evolved for the worse.
Below is a snippet from Jeff Kaplan talking at blizzcon... the mindset was totally different.
https://youtu.be/cEzhg6HtASU?t=1235