1 - Of course not. But the union - which has as it's sole purpose the interests of teachers, not the interests of students - needs to be more flexible than they often are.
2 - No argument here. But that rather reinforces my point about teachers unions.
I must confess something...I am not a very big proponent of unions. Yes, they have absolutely served a needed purpose in the past, and they can still serve as a safeguard against corporate greed even today. But that said, too many of them operate on the notion that nothing changes, and that changes to their industries - be it education or the corporate world - should not affect the workers in those industries. To me, that is completely unrealistic. Yet, it is the very nature of a union to do everything it can - including work stoppages - to get the best deal for the workers.
What unions often fail to account for are the very changes in the world that you mention. The simple fact is that changes that negatively affect a part of the workforce are not always driven by corporate greed. Sometimes, they are simply adjustments that are necessary to remain competitive in a global economy. With the importance of education in today's society, I'm not a big fan of a group that places teachers interests above those of students.