I suspect it won't end up mattering too much for most people anyway.

Eventually, we'll just end up in the same situation as we are now with video DRM; DRM being hard enough to bypass that the methods of doing so will be closely guarded scene secrets, but the output of those methods will hit Z-lib / LibGen / AnnasArchive / all the usual places.

The thing with books is that they're small by todays bandwidth and disk capacity standards, so it's really hard to stop their proliferation.

This is one of the reasons I ditched Amazon for Kobo a couple of years ago: not only was it getting harder to strip DRM (which I did regularly), but harder to get non-Kindle books onto the device. My Kobo Clara B&W is comparable to a Paperwhite, and I don't miss Amazon or Kindle at all.