As far as I know, no-one is calling for a “one state” solution. Certainly not Israel, which effectively divested itself of Gaza some years ago. Is there anyone involved in the conflict who really expects or wants Israel to take over Gaza? If not, why would we wish to include the population of Gaza in the future population of Israel?
What the current government of Israel apparently wants, is to put off statehood for the WB as long as it can, while using Palestinian weakness and inability to govern itself as an excuse to carve off bits of territory from the WB that it can (the settlements) - so that when a “two state” solution is, eventually, arrived at, either de facto (as it already more or less is) or de jure, Israel is left with more good bits than the 1967 cease-fire line would have granted it.
Thing is, as much as I dislike the strategy, it is more or less working. Due to current events, there is no possibilty of “the Muslim world” challenging Israel in the near, medium or indeed foreseeable future - they have more important issues to worry about; Lebanon, Iraq and Syria are in complete disarray; Egypt is in crisis - having violently ejected the “Muslim Brotherhood” government most likely to be sympathetic to Gaza; Iran is too far away to intervene. That leaves Jordan - hardly likely as a challenger.
What of the US? Could it influence Israel to change its course? Well, relations between the Obama government and the current Israeli government could hardly be worse - but in the immediate future, with Republicans controlling both houses, that looks unlikely.
The Europeans? Chances are that recent changes will make them less, not more, likely to intervene. As I’ve noted before, Israel has recently discovered major natural gas reserves, and plans to export them to Europe. Europe needs such exports desperately - because their other source is Russia. European willingness to cross Russia over its egregious behaviour in Ukraine is, well, underwhelming; should it be obtaining gas from Israel, rather than just Jaffa Oranges and the like … chances are its willingness to go out on a limb to support Palestinians will be just as undewhelming as its willingness to go out on a limb to support Ukrainians (a subject of far greater immediate concern to them).
The best chance for a change is a change in Israeli public opinion, leading to a change in Israeli government. Again, unfortunately, that doesn’t seem likely in the near future.