especially for those who have some form of colorblindness.
black/white color blindness is not really a thing... Adding colors for color blind people could in theory make it harder to distinguish the crosswalk pattern.
The real "risk" here is that new things make drivers turn stupid. If you've ever lived in a small city that added some traffic feature after 20 years of not having it... you'll hear about how people have crashed or broken all sorts of shit for years after. I would be most worried about that... But if that's not happening, then I don't see an issue.