macOS is simply Not An Option due to the ludicrously expensive hardware requirements - nobody sane shells out £1000+ for everyone in the company when a £150 PC is more than good enough for the majority of staff.
If all you need is email and word processing...
However, Microsoft are sleepwalking straight at a cliff. Once they push an update that takes out a medium-sized but well-known business, the larger places will suddenly decide that they can't afford the risk of staying on Windows and demand that their IT dept "fix it".
As the majority of line-of-business applications are now web-based thin clients, the underlying OS is pretty irrelevant and they'll probably ship network-booting Linux images that have a known browser and nothing else.
Windows specific applications will get ported when there's demand, and not before. A big Windows failure may create that demand.
However, if MS do walk off that cliff edge, they'll be walking on air for a year or two before the sudden drop actually happens.
It takes a while to port things.