As a HUGE D1 and lapsed D2 player, I would be interested in returning if: 1. There was a way to catch-up on the story which was missed. Bungie seem to have forgotten how to tell a meaningful narrative and doesn't require a player to play your game 100% of the time (the main reason I left was the amount of time required to play, I just had enough) 2. A move away from the seasonal model. I know you make money this way, but I'd gladly spend more on one big drop per year rather than everything time gated or drip fed. 3. A sense of mystery. TTK was THE greatest era in Destiny. The story, raid, atmosphere were perfect. There were hidden secrets, lore, fun areas to explore - it was great! More of that sense of a scary place to enter and emerge victorious from Probably a lot of other improvements I could suggest, but in general you should not just listen to the 5% of hardcore players and instead listen to light users or lapsed users to identify why they left.