Unfortunately I think you, and Greenback's similar comments above, are accurate. Unions are within every right to fight to retain any privilege or allowance that their workers have. TOCs should do more work to introduce Sundays as part of normal rostas and adequately compensate staff for this change, but in the meantime I suspect it's easier to blame unions whilst only making half an effort as the changes would be better for public service and not necessarily for profit!
Exactly. tbtc's comment re longer franchises are pertinent too. There may be more incentive for TOC's to get to grips with Sudnays (if they haven't already) when they may have more chance to recoup some of the initial outlay down the years.
One thing is certain, no business will want to negotiaite anyhting that doesn;t benefit their balance sheet in some way. Unfortunately, despite what Mr Williams says, the views of passengers seem to be the least important on the privatised railway.