>>There's one big "why not".. the makers of apps like CAD,Adobe Illustrator, etc. have hundreds of millions of dollars invested in the desktop platform (Mac and Windows) and they are getting a good return on that investment.
Can the new devices run them? sure.. but until someone ponies up hundreds of millions more to port them over, they won't.
The same is true of manufacturers of peripherals like printers and scanners.

Change is no longer directed by a vendor's self interest but by user preference. E.g. users are ignoring MS instructions in droves to choose devices from other providers. Sure the Canute providers of specialist apps will be able to defy the tide and force users to follow instructions for a while longer- but only until there is a viable choice. Vendor power evaporates as soon as somebody produces a "good enough" version that does most everything you need and is easily accessible. There is nothing new about this... Ashton Tate did it for databases when the PC arrived and so did Dr Dave, and you can be sure it's happening to Ilustrator and CAD now. Unless they get in first: AutoCAD was clever to release its free WS app for Android but now there's full CAD apps like AndCAD for the princely sum of $34.99.