My personal opinion is not in favour of the idea.
I do not like the idea of vehicles breaking down and potentially requiring replacement at a certain mileage amount. For players with very large amounts of vehicles, that would be an endless cycle of vehicle maintenance and replacements instead of actually dealing with responding to emergencies.
I know people with much larger setups than I have and I currently have 2,256 vehicles. I know that if such a feature came out, I would significantly decrease playing or stop playing altogether.
have an option button in dispatch or each station to opt in or out of the maintenance feature