As far as a card on paper you cant ask UFC for much more, that card was stacked, JB/Pettis and Rashad were on prelims, the FS1 card couldd have been a fight night.
Its just these days if its not featuring a star its only getting bough by 150-200k buys.
even STipe/Ngannou and Cyborg only doing 300's. GSP, Jones, Brock and Conor are only ones who can pull in over 500k right now.
DC/Stipe probably wont do more than 400-500k tops and that might be high. Great card but its not Jones/Stipe, if it was you'd be looking at probably 700k or more.
Shows have valuable the stars are. But from UFC POV they just doubled their guaranteed tv money so even if they have the worst PPV year next year they'll still have record revenues. To them they can do 12 PPV and maybe 3 of them do well and the other 9 do 150-250k its still making them millions and millions a year.
Only way they drop PPV's is if they lose money and because they dont pay fighters crazy amounts they make the money.