There's no debate to be had. The UN has decided and none of the naysayers have any chance of changing its decision.
The UN decided nothing. Individual States have chose to "recognize" the fragile idea of "Palestine". But they will have no idea how to implement it. As examples:
If Palestine is a State, and the government of Palestine is the PA, and the PA is living "in peace and security with its neighbors" then the PA needs to be pressured to release the hostages immediately should it not be at war with Israel.
If Palestine is a State and that State includes all the territory of Areas A, B and C, does that make all of residents of that territory citizens of Palestine? Will they be able to vote in their new State? Or is the new State of Palestine going to deny citizenship based on ethnicity?
If Palestine is a State, but unable to apply control and sovereignty over significant portions of the territory it wants to claim, does it forfeit that territory? Should Israel have a better legal claim to that territory and can apply control and sovereignty, does the territory revert to Israel?
If treaties can be dissolved by "recognition" by individual States, how will that affect international law going forward? Can the UK, France, Canada, or any combination of a majority of States, unilaterally dissolve treaties of other UN member States? Could a coalition of States dissolve the NATO treaty, as example? This seems to be a fantastically anarchist road to go down.