Not really. Israel itself is the threat to Israel's existence. Israel's occupation, land thefts, building of illegal settlements, cutting of aid from reaching the Palestinian people among other crimes Israel commits daily against the Palestinian people are some of the threat to Israel's existence. Israel past and present criminal leaders like Netanyahu and Lie-berman are the reasons Israel's existence is in danger. The blind support and the billions of dollars in aid that the USA and other nations give Israel is also a threat to Israel's existence. Using the Palestinian refugees issue is just another ploy and an excuse for Israel to continue the occupation and destroy and damage any chance for peace.
Three minors arrested in Jaffa for throwing rocks at a bus; no injuries reported (Haaretz)
from the article: Palestinian refugees are a threat to Israel's existence