How can the war realistically end?
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A return to the pre-war status quo. The withdrawal of Israeli troops, presumably in return for the hostages, with either Hamas or another group equally hostile to Israel in control of Gaza. This is the worst-case scenario for Israel, because it represents a total failure to eliminate the source of more potential October 7 attacks. I suspect it's the worst-case scenario for Gaza too, since future attacks on Israel would lead to future destruction in Gaza.
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The destruction of Hamas and the establishment of a Gazan government friendly towards Israel, perhaps by the Palestinian authority or a coalition of Arab states. Very difficult and failure-prone, but a pathway to peace in the long term. I had hoped that this would be the outcome when the war started but it isn't what Netanyahu is trying to accomplish and by now I'm not sure there's enough goodwill left for it to still be possible.
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Permanent Israeli occupation. I don't think Israel can maintain such an occupation - it would be extremely expensive in money, lives, and international goodwill. Netanyahu and his supporters seem to think that Israel can, but many of them seem to make plans reliant on divine intervention.
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Expulsion of the population of Gaza. Egypt wouldn't accept that without a war. Maybe Trump thinks he can find another country that would, but even if he did (unlikely) then the logistics of moving two million people would be extremely challenging. I think this outcome is effectively impossible - another one of the "divine intervention required" plans. However, it would be a best-case scenario for Israel. The gain in territory means little, but no longer having Gazans as neighbors immediately ends the conflict for good, which no other outcome does.
If (2) isn't going to happen then (4) may be the best case scenario for everyone. Even the people being expelled and their descendants would probably be better off than they would be if they remain in Gaza for for many more decades of conflict. However, I very much doubt that it can happen.