As the power/performance/capability/enhancements/scalability of the Arm series improves, each year, it seems that at some point, maybe in the next few years, it will be "GOOD ENOUGH" as regards cpu abilities/speed. This could allow the Arm series to take over the cpu market from top to bottom. Where top could be a new weather prediction super computer in China (or somewhere), with millions of high speed compute nodes. Bottom would be embedded stuff, such as tiny hand held devices, where Arm cpu's already have a huge proportion of the market.
From meeting other computer enthusiasts, we really care about 16 Gb RAM over 8 Gb RAM, make and capacity of the computer power supply etc etc.
But to most other people (and I have met many, and helped them with their computer issues or buying decisions, sometimes) DO NOT CARE LESS about what is inside their new computer-desk-top/laptop/ultra-portable/tiny-computer. All they seem to care about is its price, size, looks and if it is "good enough" to do stuff for them, which is often just web browsing/e-mails and other fairly low end stuff.
When the above point is reached (a viable "good enough" Arm series cpu), and assuming it is at the usual very keen Arm pricing, we may see a big shift over to Arm processors, even on larger style computers.
We seem to already be partially there, as I have seen (but not used) cheap $20..$40 tiny usb devices which are almost full computers, and plug into the back usb port of your television, turning it into a web-browsing and low end game playing (Android or Linux etc) computer. RasberryPI is another example.
I think some of the big giant super computers are already discussing (or have been) made using huge numbers of Arm processors.
Let me put it another way. If we could buy a computer for $99 total, which was Mini-ITX or smaller form factor, and it was about 50% of the performance of the current main stream Intel desktop processor, many people would be interested in buying it (I suspect).