Several comments have questioned the single point of failure. I am sure that it will be a key question for the NTSB to examine when it looks into this incident. However, I would point out that the system is designed to fail to backups, but it appears that Mr. Howard who was "worked for an FAA contractor at the Aurora facility for about eight years, handling communications there" knew what to destroy so as to prevent such back-up systems from functioning. The report mentions "The (radio) frequency failed" which would lead me to speculate that he severed the connections to the physical transmitters before torching the communications system. The comment about "a floor panel had been pulled up, exposing telecommunications cables and other wires" seems to say that Mr. Howard who should have know the system he maintained well, was able to damage a particularly sensitive set of equipment and or connections.
My biggest question is, what is so bad about a transfer to Hawaii? I'm sure there were personal reasons to stay, but I still cannot help thinking that if I gout the chance to leave Chicago for Hawaii I'd jump at it.