Like seatbelts, of it saves lives and is harmless, then why not. If no lives are saved, nobody is worse off. If one life is saved, it's worth it. Like seatbelts laws, the idea is a change in thinking not to fine people for non compliance.
I doubt it will become mandatory. It seems more like a thought bubble. Ireland used to have very high road death figures but has worked hard to change that.
Those roads already have a lower speed limit. I think the geography of the landscape and the neighbouring properties does not allow them to be more visible without loss of scenery.
Roads are designed for transport. Cars can be fatal. It's all well and good to say we should be safer but is wearing appropriate clothing when walking in a shared car pedestrian zone really be that onerous?
We already require the cars to have multiple safety standards to aid pedestrians and visibility. Cyclists are required to wear helmets in many places etc.
I am finding it odd that many comments talk about pedestrian freedom, yet jaywalking is illegal in many places but not in Ireland, where people can use their personal judgement and the cars are held responsible.