I don’t think the developers will decide to introduce this only because a person says he won’t buy the game 🙂
I support the proposal, it is pretty interesting and realistic, but it is not on the top of the missing feature I’d say. For example, I think multiplayer and competitive AI is much more important in the list of features people would like to see. And in any case, this is already a wonderful game and I don’t think any fan of train game is ready to wait other like 5 years for anything fairly close to this. 😉