There are a lot of runners on mixed use paths wearing headphones these days. They are an absolute danger to overtaking bikes. A bell they would hear would be useful.

To me, in a path with no priority to the bike, the only danger are cyclist who think they have priority and can overtake people at speed.

Being able to get the attention of runners improves the situation, reducing the speed while circulating on a mixed path solves it completely. If you wanna go fast get on a bike lane or the road.

I don't quite follow, how slowing makes the problem of a runner jumping into the side of your bike go away? If anything it makes it more likely he or she will knock you off the bike since a slower moving bike is less stable and also increases the time you are in the danger zone next to a runner. And runners do jump between the lanes for no apparent reason.

I suppose you feel similarly about the dangers bikes pose to cars?

Running with ANC headphones on is like driving with your eyes closed. Safety is a two-way street and it's everyone's responsibility to maintain a basic level of situational awareness.

Pedestrians are not danger, they are victims! Cyclist should slow down, while performing dangerous overtaking, and not crash into them! Same rules like with cars!