It only extends within sales and management. They love shiny things.
My last position was with the forth largest outsourcer in Europe and neither they, the commercial clients or the gov. departments they served used BYOD to any noticeable level. It wasn't growing either. Also there wasn't a single owned Apple asset in the CMDB that I ever came across, not one.
Try writing a spreadsheet or presentation on a phablet.
Say the word Apple in a tier one data centre and you'll be looking for a new job. It's not prejudice, the practicalities and costs mean there is no case to make. VMware is developing the hypervisor to take over the redundant O/S role completely. There won't be the pointless extra layer in every VM soon.
Now then, on the desktop, the trend is actually to make a personal computer utterly obsolete. The future is everything to be Cloud and SaaS. When this work is complete the world will have gone full circle and back to dumb terminals. Web terminals this time rather than shell ones.
You'll still need a big screen and keyboard for business though.
In short, the future is no more PC's and no more O/S full stop.