I tend to agree with comments that point out that 'modern' e-bikes are really electric motor cycles or the original "MoPed" from the 60's. And they have the same appeal, relatively cheap to operate, fit in between regulatory categories, don't require a garage to store, Etc. E-scooters aren't much better (just worse kinematics). That said, I never thought the Segway was ever going to be more than a 'niche' product whereas I had already lived in a city[1] with thousands of mopeds. To the extent they are embraced by urban planners with reduced parking mandates and their own roadways I think they are a net win for cities, when they terrorize pedestrians on sidewalks, not so much.
[1] Brussels.
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