Much of it still comes down to change management. Without wishing to disclose too much and I'm sure I'll probably be met with at best derision and at worst disbelief, I've got more experience in what these managers are (trying) to do than most, I wasn't always a railwayman.
They have failed to promote the changes in any sort of positive sense except superficially (it's apparently good for customer service but there's no guarantee your customer focussed member of staff will actually be present anymore). Having been met with resistance instead of reassuring the staff, they've gone nuclear with them. That letter has shocked pretty much everyone in the industry. Stagecoach have sued the unions before but they never took that heavy direct line with the staff - yes they made it clear that there would be consequences but withdrawal of car parking permits is just another level. I've been stood in a room in front of rounds of 30 staff a time giving them bad news about restructuring and had all sorts of grief but still looked after them.
There's been no consultation with the staff on the ground. Even if you know full well it's a sham and a foregone conclusion (first dirty trick in the book) you still at least pretend to seek views and hear concerns. Saying 'we are going to do this, whatever you do is irrelevant and by the way, we are also going to make you redundant, break your service, reemploy you on significantly less favourable terms (the loss of Hidden rights on working time being particularly striking) and if you express your displeasure as the law allows we are taking all your fringe benefits off you as well, is just declaring war on people you claim to value.
There's also been no honest explanation of the rationale behind the changes. Vague mentions of modernising and 'putting the customer at the heart of everything' mean nothing.
Regardless of the rights and wrongs of the DOO issue at hand the management have handled it appallingly.