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An e-bike is a motorcycle in everything but name and highway-worthiness. It's honestly a little bonkers how long it took for this conversation to come up. I do think there's a bit of an odd feeling strapping on a motorbike helmet when you're getting on what you think of as a bicycle, and it probably doesn't help that motorcycle helmets are bulky and a PITA to carry around if you're using your e-bike as a commuter. Those are all addressable solutions, though.
Probably the fastest/cheapest way to affect a change would be to set a top speed for eBikes operating in public areas as bicycles. Speed kills, and keeping people from doing practically 30 mph in the bike lane would probably be a good place to start. I'm not talking about handing out tickets as much as having manufacturers govern their top speeds down. After that, public health campaigns.