Maybe?

The headline graphic is from https://lab.sciencemuseum.org.uk/colour-shape-using-computer... which really tells us about the colour of a subset of objects in the Science Museum's collection – so a bit of a biased sample, and I'd wager primarily due to changes in materials.

There does seem to be maybe 20% more neutral-coloured cars since 1990, though. Interior design is probably the thing I'd most readily say has become more muted in my lifetime. I guess I'd say the world has become less saturated rather than less colourful.