[jwr]

I don't think "keep using the old version" is a solution. We should accept the truth, which is that in today's computing world you can't "keep using the old version", because you will want the bug fixes, the security fixes, and you will need the software to be updated to newer OS versions.

[jsty]

Oh I agree that most users will want / should have the updates, but having the ability to still access an older version:

(1) means the lapsed subscriber can still access their data / functionality (at least for a while until OS compatibility issues kick in), and

(2) makes sure the developer is still actually 'earning' the subscription through updates, not just counting on data lock-in.