Wow, salty discussion here!
Unlike any of you (it seems) I have actually recorded at those top-notch studios (Capitol, Ocean Way etc.), played on a few top ten songs, produced my own records, have a Grammy nomination. Not bragging, just letting you know I'm no internet troll with no credentials.
Now first off: there are $45,000 mics and in my opinion they are NOT worth that. These days you can buy incredibly inexpensive mics that are amazing and as hard as it is to believe even the most trained ears would be hard pressed to even differentiate between cheap and expensive these days. Not to say there aren't crappy ones, but there's no need to ever spend more than a couple of hundred dollars on one, in MY opinion.
As far as Macs go: of course there are a FEW studios where money is no object, but believe me, many of the big ones have been hurting, and most actual pro users here in L.A. (very much the land of the Fruit) are balking at Apple's prices. There are what, 100 AAA studios in the whole world put together? That's not even close to a market.... I see many, many smaller studios here struggling with ancient cheese graters, or even MacBooks!
Then there is the fact that software compatibility is a huge problem in MacOS these days ESPECIALLY when combined with ProTools. Literally most Mac users I know are VERY afraid to upgrade anything because it means a lot of their trusted tools will not work anymore.. An actor friend of mine with an unlimited budget (oh, those network TV paydays are unbelievable) bought an $8000 iMac, the newest version of ProTools, and a top-of-the-line Thunderbolt interface: it never worked! I'm not kidding, he tried everything, even called me, the Windows evangelist!
Bottom line: these new Mac Pros are really only for big rendering scenarios and of course people with more dollars than sense, to go with their other status symbols. A number of big time studios will probably have to buy them since almost all of them are still on 2013 Cheese Graters (oh the irony), but that's not a significant market.
In the meantime, Pro-tools has matured completely on Windows, and when you're not arbitrarily forced to buy a low-end Xeon in a $6000 system, you can build an i9 Windows machine that's actually faster for under $2000, in a nice case!
It's a strange world we live in, I'll tell ya....