Well, you know how cyclists complain about cars blocking or speeding on their parts of the street? Same goes for pedestrians and cyclists because people being assholes isn’t dependent on their type of vehicle. That’s why you have to slow down even bikes sometimes.
Or, just a thought, on a path that wide you could designate one half for cyclists and one half for pedestrians and everyone could drive at their preferred speed.
We have these where I live and pedestrians 100% ignore it. Cyclists do pretty often too.