IMHO
Modern engines are certified with fan blade off tests, therefore I would contend that damage is much more likely from turbine blade release which, since they're very hot, would pose a very strong risk to tank damage and thus fire. In addition (esp on a twin) the turbine is ususally in line with the tank...not the fan.
Two incidents that spring to mind are Manchester and the recent AA 767 that let go during a ground run causing a hull write off. Plenty of other 'engine failures' to choose from.
So perhaps not so unlikely!
What I'm curious to know is how the FCMC 'senses' that it has a 'rotor burst' situation?