How long will the mellowing out take and how many Israeli civilians will die during that?

I mean we can look at the Irish government for inspiration. When you sign a treaty to end a century conflict you tend to be pressured by your people to keep it.

There is no perceivable way for Gaza to function as a independent part of Palestine independent of either Israel or Egypt. So what’s the plan here?

The Gazan economy used to mainly rely on cash crop exports, but we all know what happened there.

Just closing the border and largely keeping out there is what Israel did the last two decades and that is exactly what ended up in an unprecedented terror attack on Israeli civilians.

Just closing the border? At this point I find it hard to believe you're discussing this in good faith, but anyway no, that's not what Israel is doing. Gaza is subject to a land, air and sea blockade that makes it so, in short, Gaza isn't allowed to have any contact with the outside world unless Israel approves it. That's not keeping out what is there, that's a military occupation.