Maybe someone will suggest that we make trains compulsory reservations, which would solve the problem if you don't mind losing the ability to turn up and go.
So for Intercity travel, you have to reserve a seat. No standees at all.
For commuters, turn everything into a glorified tube train with virtually no seats.
While I am sure first class WILL go for commuter trains, the whole point is that people who need a seat or place to work can pay extra. Don't pay extra, don't go in first class. It's pretty simple and easy to understand. And those high fares can subsidise others, so be careful about what you wish for.
So for Intercity travel, you have to reserve a seat. No standees at all.
For commuters, turn everything into a glorified tube train with virtually no seats.
While I am sure first class WILL go for commuter trains, the whole point is that people who need a seat or place to work can pay extra. Don't pay extra, don't go in first class. It's pretty simple and easy to understand. And those high fares can subsidise others, so be careful about what you wish for.