I was a LONG TERM iMac 27" user across a couple of generations... but bailed to Studio plus a 5K ultra-wide monitor since. Could never come back to 16:10. So if we're making wishes, add an ultra-wide iMac or two. All that added screen RE is very useful.
With bootcamp killed by Silicon and ARM Windows not full Windows, put at least one other input on it so people who need a PC could connect an actual PC and switch between Mac and PC. I have that with the ultra-wide and love that flexibility to use one screen with both platforms.
I agree with several of the other wishes posted by others, particularly the one about putting some m.2 slots inside that can use standard m.2 for expansion SSD inside the case. Since Macs since Big Sur can suffer from "unexpected ejections" of some- but not all- external enclosures, conceptually an Apple-endorsed way to optionally plug in some sizable storage INSIDE should yield some reliable storage of size. An "all-in-one" with drives hanging off of it is not exactly an all-in-one. Those who buy for the simplicity beauty might appreciate the flexibility for big storage inside. Of course, Apple Inc would rather sell $2200 8TB instead of letting users get 8TB for under $700 at retail... but this is a wish list, not any kind of actual expectations.
Personally, I'd never buy another all-in-one without the ability to repurpose the screen as a monitor when Apple obsoletes the tech guts (the airplay option is not good enough IMO). iMac is a great value going in but a terrible one at the end. However, make it able to easily become a monitor to use until the screen portion conks and that utility makes it more attractive.
Roll out the bigger one. 24" is great and all but I'd have zero interest in anything smaller than the traditional 27" and would be more interested in the 30"-32" rumor... again- for me- ultra wide (the one I chose for Studio is 40" but about the same screen height as the old 27" iMac- just much more of it).
The ultra-wide has a couple of easily accessible USB-A and USB-C ports on the bottom- very convenient vs. reaching around back... and a loaded hub hidden in the back, with a variety of commonly-used ports in 2024 vs. just a few of a single type.
Thicken it to MBpro base thickness if that's what it takes to offer PRO & MAX options too. It looks like the thickness difference would only a be a few millimeters and how important is the iPad on a stick look from the side when a MB (bottom half) on a stick would look almost the same unless one breaks out a mm gauge to really notice.
Dump the lightning accessories.
Again, my own opinion: no notch or island. If the only way to have a cam requires one of those, I'd rather jettison the cam and use continuity camera or similar when I need a camera.
Avoid any "stand option" nonsense. Be competitive with the monitor sellers. Include the stand options.
No $1000 stand nonsense either. That (the pricing not the stand) just looks UGLY through a consumer lens. Make an all-in-one scream consumer value -as 27" used to do- not "we need to fill new vault number 89+, so what else can we turn into lucrative upsell options?"
