Obviously if he leaves it'll be a big blow to the division. However if Jones and Stipe come back and take fights at HW... the division won't be that horrible. You'd have:
Stipe Miocic- UFC HW division GOAT
Jon Jones- One of the all-time GOAT's
Cyril Gane- Not the greatest performance vs Francis, but he is still tremendously talented and young/inexperienced. It stands to reason that he'll continue to improve and be a top HW for years to come
Derrick Lewis- Most KO's in UFC history. 17-6 in the UFC with 13 KO's. The guy has wins over Ngannou, Blaydes, Volkov, Travis Browne, Roy Nelson, Gabriel Gonzaga. He's an elite HW and has been for awhile
Curtis Blaydes- Best wrestler in the division. 11-3 in the UFC. Wins over Overeem, JDS, Hunt, Volkov. Still only 30 years old and will be a tough out for anyone in the division for the next several years and definitely has champ potential
Alexander Volkov- Great striker and still in his prime. Very solid gatekeeper for the Top 5
Jairzinho Rozenstruik- Similar to above. Also has the big KO power
Tom Aspinall- Tremendous HW prospect with all around skills and killer instinct. Undefeated in the UFC, never gone to a decision in his career, still only 28 years old. Has champ potential
Tai Tuivasa- One of the funnest fighters in the game, and just a tank with huge KO power. Still improving and on a 4 fight win streak now. He'll give anyone a tough fight
Chris Daukaus- Sure he lost to Lewis, but so have most people who fought him. Still a rising fighter with huge KO power and will be fun to watch over the next few years
That's a pretty good, fun group of 10 fighters that I'm down to watch on any given night. It's certainly one of the weaker divisions in the UFC, but there's still plenty to enjoy there, especially if Jon enters the mix.
