Common livery is not the most important thing in a public transport network, but it is important. It’s a reminder that while the system may be run by lots of different companies, it is meant (in theory at least) to be one network.
The tickets and fare system are common, the routes should be designed to connect not compete, the timetables should complement each other and co-ordinate where possible.
The biggest change is in buses, where a myriad of colour schemes are coming together as one, with the operator name/logo reduced in size so it’s no longer significant — reflecting the practice in cities like London, but also closer to home in Adelaide and Perth.
Mind you it can also add to passenger confusion, in areas where passengers are used to differently coloured buses running specific routes.
Edit: This confusion can be reduced if route numbers are clearly displayed, not just on the front of the bus, but also on the side and back. Some buses have this already. It should be standard.
It sounds like only the (multi-company) Smartbus fleet will retain its distinctive bus colours.
I didn’t manage to get one of the few V/Line PTV-branded carriages into this photo. I guess that’s the next challenge (and to show the distinctive side design on a bus more clearly, rather than just the plain white front). You can see it in this snap a few seconds after the above photo… though the exposure was too short to properly show the tram LED number display. (In all honesty, none of the LED display showed in the above photo — I photoshopped it from another snap a moment later.)
Hopefully, having completely branded everything to PTV in the coming months, the powers that be will stick with that for many years to come.
Given some of the trains in particular have gone in the last twenty years through The Met (2 versions), Bayside/Hillside Trains, Connex/M>Train, Connex, Metro, and now PTV, I think everybody’s had enough rebranding for now.