What’s this ‘if’? Just say deal’s off.
Sure. We got Schalit back. What are they going to do now? Not grab any more hostages to ransom, because we went back on our word? Grab lots more hostages and have their whole little operation shut down once and for all (probably a lot harder to hide even one, now that GS has been debriefed)? Sue at the Hague for the return of Gilad?