I think they may, despite disruption, actually find considerable passenger and taxpayer support in that, too. I'd not want to cut anyone's pay, but there are certainly archaic practices on the railway not in keeping with any other industry*, and I would be happy that those be challenged even at the cost of a little disruption.
With regard to pensions I would have no issue with them becoming contributory rather than final-salary-based for new employees, and would again be happy for that fight to be had. Final salary pensions are basically non-viable and have been abolished across industry.
* e.g., as noted above, people asking for money to simply do their job properly**, or to start using a new piece of tech in their job which is simply part of the way that job evolves, e.g. scanning tickets instead of scribbling on them with a biro.
** I get why they want to pay the "scanning bonus", but to be honest I'd just discipline e.g. the bone-idle guards on the south WCML who mostly hide in the cab and don't do tickets - as I've said before, only about 3 of them bother, and you know it's the same ones as you recognise them. That or if it's not important due to the gatelines offer them the choice, if they prefer, to be downgraded to non-revenue guards at a commensurate pay reduction.