We would like you to buy the Studio display with a Mac Mini or or Mac Studio or Macbook (preferably all specced out) separately.
Just like the old Thunderbolt display, the Studio Display makes more sense as the ultimate MacBook docking station than as a display for a desktop system - and there are a
lot more MacBook users than iMac users.
I'm using my Mac Studio with a pair of 3:2 4K+ displays which I find perfectly suited to my use. It's not that a pair of 5k Studio Displays wouldn't be
nice but it would cost 3x as much... and bearing in mind that I don't want/need speakers in my display anyway (I have an external audio interface and some nice studio monitors which sound far better than
anything built into a display), only need one webcam (I don't Zoom in 3D!), and don't need to charge
one large laptop, let alone two, it would be terribly wasteful.
Mac Studio + Studio display is a perfectly reasonable choice (and costs about the same as a comparable i9 iMac, and a lot
less than a comparable iMac Pro) but a big plus of the Mac Studio is that you could instead choose to use it with a Pro XDR display, or a bunch of third party displays.
There
is a gap in the range where the $1800-$2000 iMac 5k models would have been - but the iMac market is being eaten away from several directions:
First, the 24" iMac now has a larger, better screen and more processing/graphics power than the old 21.5" iMacs ever did - so they'll take some sales from the 5k. Then there's the option of the Mac Mini + 3rd party display which will outperform the lower-end 5k iMacs (unless you climb on the desk with a magnifying glass to do A/B comparisons between 4k and 5k screens). Then, the days of the i7/i9 iMac/discrete GPU combos out-performing the top MacBook Pros are over, with Apple Silicon - so strike off all those customers who needed a MacBook for portability and an iMac for power, - now they can just get a MBP and - if they like - add a Studio Display (or cheaper option). Yup, the M1 laptops will have seriously curtailed the sale of Mac desktops.
Some people obviously liked the all-in-one iMac, but plenty of others always hated the idea of having a high-end Mac and a high-end display inseparably welded together, so you couldn't choose your own screen (Pro XDR or third party) or replace one without the other down the line. In a perfect world, maybe the iMac and Mac Studio would co-exist but I guess Apple don't see enough demand to justify both.