Well, it all comes down to the limits of economic engines. Just like any engine, it will not being able to take-on ever increasing parasitic loads up into infinity.It is obvious to the dimmest of wits that one cannot kill the goose that lays the golden egg in the expectation of riches hidden somewhere inside. Thus I think it is foolish to believe that the union leaders really expect they can make such demands work for any time at all.
The Left never liked the economic engine that made the West, and particularly America, as great as she is. So now that they've brought us to the brink of bankruptcy, the unspoken slogan of their tactic seems to be "Let's finish the old girl off!"
The nihilists seem to be in firm control of the Left, and they are engaging in the sort of agit-prop that favors the goals of the Statists who so hunger for global control. Kill the engine that makes liberty possible, and the distance from here to The Abolition of Man will be but a very short step. The process which, if not checked, will abolish Man goes on apace among Communists and Democrats no less than among Fascists.