I totally agree with Alatar that Denethor's end could have happened on the walls of Minas Tirith or during a desperate attempt to stop Witch King from entering the city if he had followed Gandalf's advice.
It's all looks more complex if he had survived. It looks to me as if Denethor has fallen under the spell of the ring just by knowing about it as Sauman did. But with the end of Sauron and the ring Denethor could have recovered from the spell. In this case he might have changed his view of Aragorn, especially after Aragorn saves Faramir. So Denethor could have resigned and either spend his time with Faramir's family or travel along Boromir's pass to Rivendell, where he could have stayed for good learning the lore and compiling memories just like Bilbo.
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