And then you are at a competitive disadvantage because half your business no longer functions.
It functions exactly the same way it always did. Snow Leopard didn’t start working when Lion was released. Windows XP still works, despite Windows 8 being the latest and greatest.
If you want newer hardware/software, well of course you have to upgrade. That’s not a vendor or operating system specific concept.
The last few OS upgrades have been free, mind you. If you need new hardware to run the latest software, then you need new hardware to run the latest software, regardless again of vendor.
Once again, you’re trying to turn something that’s a tautology into a “gotcha” point.