So long as they still work well that’s perfectly fine. I don’t want public transit to need to be the newest shiniest thing, I want it to be effective, safe, and affordable. Physical media that’s difficult to acquire and alter is great. Hell I’d be fine with a “secure governmental bus” being developed that’s only legal to produce for government contracts. But yeah, I don’t want public transit to chase trends except of the population distribution variety (though I do support all hours driverless trains as a means to increase user convenience/price ratios)