I think they do they're just not willing to say it for international media. They want either total elimination of the Palestinian people or they move somewhere else. The starving out open-air prison treatment is ending - on Israel's hideous terms or on Palestine's terms but it sure seems like the old strategy is over.
They've already said they are no longer responsible for food, water, electricity, sewage or anything else in Gaza. Their plan is to bomb the shit out of it, annex probably half of it, and and anyone who wants to live in the post-apocalyptic ruins in the other half is welcome to.
You have way too much faith in the military. The lack of an “exit strategy” was the main criticism against the US led Iraq war. The situation in Israel in particular has not screamed “we have a plan” for the last half century.