Stating the obvious that I don't see in this thread yet: If there really is an active community around it that wants to keep this alive, why don't those people get active, cut some deal with Amazon and then run the show on their own?
As the discussions here have shown, server space+traffic costs are expected to be low and could easily work with donations. Then you need some technically inclined people to put in the maintenance work in their free time, but that's the same as with basically every online non-profit community made by and for enthusiasts.
If that's not happening then clearly interest is just not big enough and shutting down the logical consequence. Web archive is still around (and we all should take a moment and consider a donation, whether you care abouy DPReviews or not.)