That means higher taxes that someone has to pay. Which taxes have scope for increases? What funding can be diverted to the railway from elsewhere?
Every decision has trade-offs. Personally, I would move some money from the roads to the railways budget, but I understand others would make different choices. The point being that, for a new government with different priorities, if they wanted to more money for the railway could be found. The question is of course whether they will want to.
That triggers industrial relations issues
The only TOCs with non-commercial guards are Merseyrail and SWR, right?
For Merseyrail, the solution would be to go DOO when the new stock is fully in place, and retrain the current guards to drivers, RPIs or transfer them to other TOCs (Northern/Avanti/TfW/TPE)
For SWR, institute a no new hires rule for the non-commercial guards, and only take on new staff at the commercial guard side, then over time there will only be commercial guards left.
To be honest, I am surprised that non-commercial guards even exist. Specifically on Merseyrail, why does that need 2 members of staff on every train?
True, but not solving them also costs money
Fully agreed there!