Who said they wouldn't do the work? Heck, they'd be willing to take a pay cut to keep their jobs. Why should they do ALL of that...pay cuts, benefit cuts, etc. if GM cannot say that their jobs will be there tomorrow?
I feel badly for GM. There should have been a way to work it out. The UAW leadership can be trusted about as far as you can throw a Buick.
Jobs bank programs — 12,000 paid not to work
Big 3 and suppliers pay billions to keep downsized UAW members on payroll in decades-long deal.
http://www.detnews.com/2005/autosinsider/0510/17/A01-351179.htm