I understand Hamas is indirectly a danger to Egypt, do in part to its Iranian ties and support of anti Egyptian groups but there has to be more to it than that. With 52% of Gaza refugees Hamas could be reelected for years to come. The blockade is starting to cause problems for Israel albeit small but growing in both with the Muslim street and in the EU. With many Hamas/Gaza leader being released from jail, I see pressure starting to build against it and likely next year will become a major problem for Israel's PR.
Russia: U.S. plan to provide air cover for Syrian rebels undermines Damascus fight on ISIS (Reuters)
from the article: Israel spurned Qatar's Gaza offer after Egypt protest