It depends on what economic cycle, how profitable the company and how much work you have. Unions thrive in economic booms..die in recessions. Take AT&T and Verizon..huge, unionized and profitable in wireless but the land-line end of it is losing money and they are slow. AT&T will be looking for big givebacks in pension, etc, big increase in health co-pays in next contract. Ditto Verizon. YRC is not out of the woods but more concessions are not in the cards. Unless we have a boom cycle soon where everyone is working and hiring..YRC will be sucking air.
On the other hand Hostess, in big financial trouble employees like 19,000 teamsters. They want new work rules (not a strike issue) they want to eliminate the pension permanently. Definitely a strike issue