Anyone who takes them up on their offer to buy a new Kindle should check themselves in for a mental health screening.
They just told all of their customers that you cannot trust a device you buy from them will continue to work in the future. So buy one from a different manufacturer and hope they aren't as evil
I get that it may be expensive to perpetually support old devices but there is surely a middle ground between supporting them and bricking them.
Even if you have a large library on kindle I hope you have the 'calibre' to move devices.