But to say that other Muslims won't defend them misses the reason there are Palestinians in the first place.
The Muslim countries (Saudis, Iran, Syria, Egypt, et al) back the Palestinians because of Israel. They use the Palestinians to destroy Israel. They keep the Palestinians locked up in the camps. They arm Hamas, Islamic Jihad, and a myriad of other terror groups. They provide weaponry, manpower, and money. They provide diplomatic cover and international pressure. They do it for one reason. To rid Israel of its Jewish population.
There objectives have not changed since 1948. What they couldn't do militarily in 1948, 1967, and 1973... they now do through terror and international pressure.
So, I do see them defended by other Muslims. But their defense would be a pretext... the true reason would be the destruction of Israel.