I think I like the sentiment that the best market for these bikes is people who don't even look at motorcycles now.
Honestly, I didn't go looking for an electric bike. A year or so ago my only vehicle was an aging (1997, 178k on the clock) BMW 528i that I've loved dearly, but clearly it was time to start looking at new rides. I'm a huge believer in EVs, but a Tesla is way out of my price range and no other electric car inspired me much if at all. But I'm also a lifetime bike rider, had been without a bike for two years, and suddenly realized that an electric bike would fill my needs even better than an electric car: I could keep the BMW for long trips/carrying passengers/bad weather, but an electric bike would handle 95% of my driving needs (commuting and short errands) and allow me to cut WAY down on miles on the car. I figured it would also cost a lot less and be even cheaper per mile to drive than an electric car.
How right I was! My transportation expenses are now a small fraction of what they were, I get to ride a very fun and satisfying motorcycle just about every day, and I still have an ICE car for when I need it, whose gas tank now gets filled less than once a month, instead of more than once a week.
In terms of filling all of my transportation needs, reducing costs, but not leaving me without options for long drives, carrying passengers or bad weather, I don't think there's a better combination than the electric bike and ICE car. Maybe when the electric cars have Tesla-like ranges at Honda Fit-type prices, and fast-charging stations are all over this nation, things will be different, but for now I don't know of any way to beat my combination. And even when/if that day comes, electric cars will still never offer the sheer efficiency and low driving costs of an electric bike.