They need to get their story straight. Besides, these missing democrats are doing a better job of representing the interests of their constituents than they would if they were just going to be automatically voted down anyway. The republicans who want the democrats to return are not the constituents of these representatives anyway.
It is also worth noting that Walker has tried to manufacture this kind of phony crisis before, when he tried to bust courthouse unions in Milwaukee in favor of a fat-cat crony deal with Wackenhut. He failed to follow the law then as well, however, and now Milwaukee has to pay back pay to all their courthouse security, as well as pay for the private contract.
This phony $137 million budget "crisis" is as transparently fraudulent as they get. Even in New Mexico we have a budget shortfall of larger than that and our total operating budget is far less. Every year legislators deal with gaps bigger than this and routinely plug them without abolisihing the rights of public employee unions.
On top of that, Walker offered about as much in tax breaks to businesses as the total amount of the alleged "shortfall". If there was really a budget crisis then all he would have to do to plug it would be to rescind the tax breaks, rather than demand that public workers take what amounts to an 8% pay cut.