The requirement bestowed on software/computers that we use and the way we use them is changing and isn't the same when the last PPC->x86 transition happened.
If what is required is moooaaar powaaah then yes, it wouldn't make sense to migrate to ARM over x86, but thats not the way the computer/software industry is/has been going. SaaS is more and more prominent, even the likes of Autodesk have perpetual lics these days and iOS apps for AutoCAD etc. As we embrace SaaS more, the emphasis and workloads will be hosted (perhaps the other side of the office, or other side of the planet, but not for each 'seat'). There are already web apps (https://app.formit.autodesk.com/
) and then look at otoy and other online renderers. Everything we do will be streamed soon... even 4K gaming. It's already happening!
The battle ground won't be between vendors trying to get their workstations to their clients, it will be between providing a collaborative solution for workflows.... and data centres. First stop... proving these web portals can provide the functionality...done! next stop, reaching out to all those customers and businesses who don't want to buy expensive PC's for each one of their designers/engineers. All it needs to do is be web (2018) friendly, and most computers in the last number of years have been that.
A bit like bitcoin mining, gone are the days when anyone who could afford it go out and get 4xTitans. These days you need to be part of a collaborative team (or have a shite load of CPU power...or hack UK government computers idle time http://www.bbc.co.uk/news/technology-43025788
). No more is this a game for someone with an above average PC. Remove bitcoin mining and insert another CPU/GPU intensive workload and the same applies.... specialist PC workloads have become so intensive that its no longer viable to do them on a PC... especially when the 'access to the outside world' bandwidth is so great theses days.
It wouldn't surprise me if in 10 years or so we will be reminiscing about being able to install fully featured applications on clients (PC's) and run them without phoning home…. Non SaaSy!