None of that tells me how the Palestinians would sustain their own country if they were given their own country today.
First of all, it doesn't matter. It's not for us, or anyone else to say "Well, they wouldn't be able to sustain themselves without help, so we should just take it upon ourselves to dissolve their country."
Second, the region has sustained itself for thousands of years. There is this notion that Palestine cannot survive on its own, and that it should accordingly become one with Israel. I don't understand this bullshit. It's outright racist to presume that Palestinians cannot maintain their own country just because. It's completely unfounded. The main problems Palestine faces today are the fact that it is a land that has been ravaged by Israeli military campaigns for more than half a century. It's a war torn region. ANY country will suffer great hardships under such circumstances. Israel makes war against Palestine, and then people say "well look, things are bad for them, they must not be their own country." It's all predicated on an assumption that Israel is always right, everything they do is always right, and everything Palestine does is always wrong.
Palestine needs what every country needs, and that is peace. The only reason Israel has fared so well over the years is because the US has provided so much heavy aid to Israel, to include a hearty helping of military equipment.