When there will be a business case. That means, when there will be people willing to purchase Linux versions of Adobe/Autodesk/whatever apps, but not their Windows or Mac versions.
Normally, when people need Adobe/whatever, they will purchase also whatever OS is needed to run them - if you are getting expensive pro apps, 130 EUR/OS license (pro/oem/before VAT) is a rounding error. To Adobe this signals, that the porting effort would be a wasted effort, which they can save and earn the same revenue anyway.
So it is more realistic that some competitor appears, fills that demand and grows somewhat, before established vendors notice.
I think this is becoming a real possibility.
The other day I realized that all of the commercial FPGA design tools I use, from Xilinx, Altera/Intel, and Lattice, are available for Linux as well as Windows.
And despite being fairly expensive if you need the versions that support larger FPGAs, they all provide a free version.
Naturally they target the enterprise distributions like RHEL, and there are quirks in general and some friction to using them on other distributions, but they actually work and they're supported.
Now, perhaps there's something about the people working on FPGAs that makes demand for Linux versions of those tools much higher, I don't know. But I wouldn't be surprised if the percentage of installations for those tools was still mostly on Windows.
Autodesk has many programs now that run on Linux. Maya has run on linux for over 15 years.
Meanwhile their original product, 3ds max, is pretty locked into Windows.
It was originally a DOS application, which was rewritten for Windows, and is used in game development.
It doesn't make sense to say Autodesk doesn't 'properly support Linux' when they have software for Linux, and one program that isn't for Linux doesn't really have much demand on Linux in the first place.
Years ago I would end up drifting back into Windows.
However I haven't logged into Windows for a while now, and I'm considering deleting the partition.
When are Adobe and Autodesk going to support Linux properly? They are the only non-gaming reason for Windows now.