The issue is that my personal opinion does not matter here; the whole point of the lawsuit is to find what is "reasonable" as per the law.

Now, if you are just looking to chat. Here it goes:

For a company with the resources of Amazon, I'd say it's reasonable that they never cut off their own products as long as they continue in the branch of business these products are intended to serve. In this case, if amazon will continue selling and distributing digital eBooks, then they should continue supporting their old hardware with the service.

If for a technical reason this cannot be accomplished; for example, if the new standard of eBooks is incompatible with the old hardware AND an update is not technically feasible (TECHNICALLY feasible, not "it cost me money"); then Amazon should jailbreak the old devices, for free, so the customers that bought it could more easily find alternatives

PS: please note that a personal option, or making it "simple" or "direct", are artificially imposed barriers to "win" here imposed by you. My point continues to be that it is reasonable for this lawsuit to take place precisely so that a definition of "reasonable" can be recorded in case law