No one expects Win7 to work on all modern hardware. Indeed, my company has bought modern computers that come with Win10 drivers for the I/O, and Win7 won't run on those machines until you find the appropriate drivers. We've all been there before.
But withholding security patches that were promised until 2020 is something else entirely. That's blackmail, or a thinly-veiled protection racket.
True, they never said it would work on all new CPUs forever. But neither did they say they were going to break an important promise to their customers.
[[But neither did they say they were going to break an important promise to their customers. ]]
There may be a lawsuit- it might be thin- but as you point out- it’s almost like extortion- Get people hooked on the drug- then tell them you are going to with-hold it unless they update to your new crappy drug