The only people who miss cabooses are railfans and model railroaders. Professional railroaders hated them. The slack action was incredible and they were the major source of train crew injuries. This is why they were phased out, not for any saving in crew cost. Remember the BQ-23-7?
As a professional railroader, there are times that three men are needed to operate a train, especially if it has major switching duties en route. At other times, two men suffice. And, yes, there are limited times where one man can safely operate a train, especially if equipped with a remote control belt pack.
In truth, it is between management, the unions, and the Federal Railroad Administration (OSHA cannot interfere with railroads, thank God!) to decide how to man trains on the Class I railroads, and a bunch of foamers running around making threats sure won't help matters any! They just might convince a few more shippers to convert to truck, and then they will just have a few less trains to drool over.