We still have 7 year old Chromebooks and Windows Desktops running fine at the School District I work at; the Chromebook hinges on some models are starting to fail but most of the maintenance I do is on student damage (picked letters off, etc). The Chromebooks have 10 years of updates then we must get rid of them by District policy.
We used to buy around 120 a year, but the price over doubled from ~$150 a unit to ~$360 a unit so we bought only 60 this year.
I have a big pile of Chromebooks where maintenance wasn't really worth the labour (e.g. they have a loose hinge and 12 missing keys, where I would have to cut off the rubber nodule from a donor machine and carefully glue it back on to the keyboard/chassis, to repair the key) But this year I may indeed go through them as much as I can.
Now I don't know about big corporations but I'd say a 7 year lifespan is common now for desktops. 10 years perhaps. We bought low-mid end desktops in 2019 - Core i5, they were the right model to support Win11 so I can easily see us getting another 3 years out of them. We do get the occasional failure, out of 120 8 have failed. SSD or Mainboard.
Laptops after 7 years most have failed due to I/O ports failing. USB-C charging ports mostly.
Businesses will just buy more refurbed desktops if they must. There are many Refurbed models on the market - usually when a company did a refresh "because they need a refresh" these desktops are refurbed and sold on for $100. I am seeing some prices now reach $200 for a refurbed Lenovo desktop but there are still plenty of $100 units available.
The public will just do what they do now. Use a phone. Everyone has a phone, and there will always be phones on contract, hand me down phones, etc. Who in the general public uses a laptop now? Adults use phones, small children use tablets, and computers are only used in schools or businesses.
The Elites want us all paying rent for everything now anyway, so this might suit them in that the only way to "own" a phone affordably would be to rent one on contract.
Rent a Gaming PC enterprises I'm sure they all failed in the past but from now on who knows. I still run a Core i7 5820k. This is a chip released in 2014! a 12 Year old Chip! Granted I have an Nvidia 5060 GPU but this GPU still pulls its weight running Doom Eternal at 4k, the 2025+ Age of Mythology remake etc.
It shows how much CPU performance basically hasn't improved in the last 10 years. Imagine if I bought a 486 in 1990 - and was still using it in 2002 when Doom 3 came out. I was thinking about getting a new Ryzen system but with RAM prices, I'll wait until the Chinese start making cheap RAM.