The problem with that idea is twofold, I think.
1. Mac Pro buyers are a completely
different buying group price-wise to Studio
Max buyers (and even
most Studio
Ultra buyers too!), due to the MP likely starting at $7-8k absolute minimum (plus extra to get the machine those buyers really need) and going well into double-digit thousands – maybe as high as $50k if the current MPs are a guide, depending on how Apple handles what goes into the machine to justify its pricing structure.
No other
desktop machine other than the Studio has the Max chip in it, as it's clear Apple now delineates each Mac by the
name of the chip within and the extra cooling needed for Max and Ultra chips that each Studio offers (Max has much bigger fans than the Mini Pro, while Ultra has those even beefier copper fans). Thus only the Studio will get the Max chips in the desktops.
2. As the second gen Max chip (M2 Max)
already exists in the
laptop line (in MBPs), Apple must realise buyers will wonder why they don't just put this chip into the desktop Studio in the near future, with a great many now holding-off buying a Studio Max until then if they don't need one right now – especially as we all now understand Apple's philosophy with the Mini's only getting the standard & Pro chips due to the cooling constraints.
Sure, MP is logical to update first as it's very overdue, so around WWDC makes sense for Apple, and they'll want to release it before any Studio update, so the latter doesn't eat into MP sales. With the MP likely have its own new chip name like M2 Extreme, or perhaps its own double/quad versions of the Ultra (Ultra Duo / Ultra Quad), and top pro buyers who need and can afford them will purchase.
But the
majority of buyers waiting will not be in that MP buying group due to the very high cost, so will then be dying to buy an updated Studio with the Max chip ASAP. Autumn makes sense for that (~20 months since Mar 2022 release of current model), as the standard M3 chip is likely to hit MBAs in early 2024 (~18 months since Jun 2022 release of current model), then some months delay before they can do M3 Pro & Max variants for MBPs at end of 2024 (~18 months from Jan 2023).
We'll have to see, of course!