The Gaza Strip seems very poorly served by the Palestinian Authority, let alone Israel. But, the area has relatively stable borders and it would likely have a stable government in Hamas. So, what if Gaza just declared independence as the government with sole control over the Gaza Strip?
Would Gaza get recognized by other countries? Could it parlay the recognition into forcing a permanent peace with Israel as becoming a recognized country puts Israeli treatment of it into more known sections of international law?
They can declare whatever they want, but if the major nations of the world do not recognize their declaration as valid and support them then it's a hollow victory. The PLO declared an independent Palestinian state back in 1988. Many nations recognize it as an independent state today, and many nations do not.
https://en.wikipedia.org/wiki/International_recognition_of_the_State_of_Palestine