it's not obvious to me how utopian this will feel as the percentage of (quite high powered) ebikes continues to grow. There is a chance that the golden age of city cycling is over.
[0]: https://www.calbike.org/studies-show-increases-in-biking-and...
Assuming any US cities focus on bikeability, by the time we've figured things out enough to actually worry about this problem, hopefully the Dutch will have figured it out. I know ebikes are a very real concern in the Netherlands and there's a lot of active lawmaking on the subject right now.
Ebikes fill a gap, they increase commute 'radius' for a lot of people, allow elderly to ride when they wouldn't be able to with a normal bike, etc. \
Also in my opinion ebikes are going to be critical for us to role out the Dutch model in other locations that are not as insanely flat. I cycle everyday for school rounds and general errands on a normal 7 gear bike without batteries but even if they had the same bicycle infrastructure as the Netherlands, I would probably not do the same in hilly cities like Granada, or Bristol or Lisbon, because I would just be sweating all the time.
Whatever idea you have of ebikes on steroids is simply niche and not what the average consumer buys as an ebike.
Electric mopeds is another problem though.
I'm not familiar with the Netherlands, but in Belgium legislation was introduced to tackle that problem. Above 25km/h, they are essentially considered motorcycles, requiring a similar driver's license and follow the motorcycle rules of the road. (https://www.vlaanderen.be/speedpedelec)
E-scooters are limited to 25km/h and follow cyclist rules, e.g. they cannot be used on sidewalks.
The number of speed pedelecs in the Flanders region is relatively high, because many companies have started offering leased e-bikes as a way to do tax optimization. (sadly, the same tax incentive exists for car leasing, so the number of cars on the road is still too damn high)