A united and reinvigorated PLO operating from both the West Bank and Gaza would be the most likely way to realize an independent Palestinian state. The real question though remains about what to do with the Israeli state and occupiers. Any Palestinian state will be under constant threat from both individual Israeli terrorists and terror organizations like the IDF, many of which have effectively settled in the West Bank. There would likely need to be some UN-backed peacekeeping operation to safeguard Palestine even with full recognition of independence.