I think he would've been happy to see a Jewish state in existence, but I think he would wonder why all this war is happening between these two peoples, and wonder who started it? And probably be upset by stating this may have not been his intention, war.
It depends, what exactly was he advocating for? Was he advocating for the total take back of the land? Or was he advocating for a Jewish state in the land, and was okay with the Jews sharing it with the Arabs?