I agree with your post, apart from “a mess for Israel”. As long as the fighting continues, Israel can quietly finish building its fences, continue to build new homes in the areas ethnically cleansed of Jews in 1948, and watch tearfully /s as Hizbollah feeds itself to the guns in Syria. Meanwhile, the US is unable to apply any pressure whatsoever, and this is more true now that the fragility of Egyptian society has reared again.
Their societies are on the bring of absolute unraveling and mayhem but, it won't last forever and the danger to Israel, post-Syria civil war, Hizbollah combat experience and mayhem in Egypt will rear it's ugly head in the future.
What absolutely fascinates me is the fact that the Egyptian Junta and Israel seem to be on the same playing field on this one. Both are cooperating in ridding themselves of the Salafists and HAMAS or Jihad elements. In addition the Egyptian Air Force is destroying tunnels between Gaza and Sinai. Too bad they waited this long.
The great thing, is that both Egypt and Israel are turning their backs on Obama & Co. They know he's worthless and cannot be relied on.