UFC can't be (and won't be) THAT short-sighted.
Yes, a "super fight" sells a ton of PPV and makes lots of money today.
But there's a feeling that JJ's retirement will mean the end of the best generation of fighters the company has ever seen (GSP, AS, DC, DJ... you know).
A step below, legends such as Aldo, Khabib, Usman, Volk, Adesanya, Miocic, Holloway, Poirier... are either retired or a fight away from riding to the sunset.
The passing of the torch is going fairly well: Merab, Ilia, DDP, Poatan, Aspinall... but it would take time before any of these fighters achieve the same greatness than the names before them.
Then you have Islam, just two victories away from the longest winning streak of all-time.
And Ilia, the most exciting undefeated fighter in the company.
Powerful and non-manufactured narratives, history being made, makes way more money in the long term.
Because any subsequent Islam fight is one for the books, and a legend would enter the cage every time.
Risking Topuria or Makhachev in a super fight is in fact a lose/lose scenario for the UFC.