Absolutely everything I've
ever read, heard, & seen (including Disney!) says Disney has always/only honored the
full day(s) remaining. The tickets are just like "Forever" stamps; no matter how much first class postage skyrockets, the price I paid for that stamp guarantees the 1st class delivery whenever I decide to use it (don't want to open a "Pandora's box" on the future of USPS lol). Disney proudly promoted
back then that tickets "never expired."
Besides, I doubt there are all that many "unused" tickets floating out there (nevermind how many likely get thrown away b/c they're either mixed-in with other papers or whoever finds them doesn't think they're worth anything, etc, etc, etc), and no-doubt Disney took all that into consideration (for example, everything they sell now certainly has an "expiration.")
IF Disney ever were to try any inflation-adjustment-penny-pinching BS with me, not only would I never give them another penny again under any circumstance, but I would use my story at every opportunity to encourage everyone I knew to do the same (nevermind the plethora of other examples given through these forums and elsewhere).
However, I don't know of any instance of "Park Hopper" being included when someone redeemed an old ticket, which I'm fine with. I consider "Park Hopping" too much work now lol.
Besides (one more time) Disney still wins here with all the money spent for food, souvenirs, etc.
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