On the current interior the floors get dirty far too fast and the rest is just for lack of a better word "bland". It wouldn't take much to improve it, but it's just not there for me.
With the Barbie interior the dark floors were a good thing, many of the buses with the Barbie interior still have their original floor and it's still tidy, where as vehicles that are less than 4 years old with the current interior already look like they need the floors ripped up. the cream panelling could get stained over time, but it wasn't too bad, just down to the local standards of clean.
This is not the best photo but here's one of our almost 18 year old B10BLEs recently. The Interior is still as new and the only work they've had on them was a re-trim at the start of the year. The floor is still in good condition for it's age, there's no permanent staining and all it would need is a good clean. I don't have a good photo of a bus with the newer interior, but if you compare a 5 year old Enviro300 at Aberdeen/Glasgow for example, you'll notice just how bad the staining is on the floor. Some buses have turned more Yellow than lilac.