The thing I don't understand is how circulating cryoprotectant chemicals through the brain doesn't destroy the tissue. How could anything other than blood safely circulate through the brain?
Regardless of the fluid medium, a bigger problem is absence of oxygen is going to start the process of autolysis after cell death. Neurons are particularly vulnerable, which how people can become brain dead within 5-10 minutes under normal circumstances.
The even bigger problem is cellular damage from the freezing process. Proponents of this sort of thing would say the "cryoprotectant" chemicals vitrify, so the massive small scale trauma from ice crystal formation is prevented. I'm not sure anything has ever been reanimated after this process, nor do I foresee a technology capable of allowing it.
Finally, and maybe the biggest problem, it is hard to see technological cure for advanced ALS. It is a structure problem with demyelination causing the symptoms. Even if you could correct the underlying source of myelin cell death/inflammation, it's very difficult to imagine a restoration process that results in viable life.
Anyway, probably more than you wanted to hear. This is just kind of sad, and reminds me this is a young forum on the whole that probably isn't too in tune with their own mortality (this is not directed at anyone, so I'd prefer nobody respond personally to it). He is dead, he lived well, there will be nobody else quite like him.
edit: fyi, http://en.wikipedia.org/wiki/Blood_substitute (though again, this differs because the cryopreserving fluid is selected because of its properties when freezing)