In the cities, where real people live there, it is not. Every part of the city needs servicing, including center. Your plumber won't lug his tools on a scooter; your furniture won't teleport itself into your house either. Every now and then, the residents themselves need to bring in or out their heavier or larger crap, so issuing permits to entry to well-connected companies is not a solution.
Yes, I do live in city center; and yes, we also have people who know nothing about living there, but they go to pub there every Saturday night, so they have strong ideas how it should be. It is not limiting them, after all.
Edit: just for clarity: this model is already working (plumbers, movers and locals included).
In a given area (say a full city block, including all roads and alleys within and bordering that block), you might want...
- Pedestrian lane
- Bike+scooter lane (any transport that's ~20mph and <500lbs loaded). That may or may not include gas scooters (50cc Vespa type).
- Auto lane
- parking lane (could be a mix of bike/car parking)
- possibly a transit lane (bus, light rail, etc)
And you don't need every one of these on every block/street - you can alternate. Or use one-way auto lanes on alternating streets to make room for the other modes of transport.
Most cities do not have a car lane sized lane to spare.
If you want to live downtown and own a car, you can rent a parking space in a garage.
Cars are an incredibly inefficient way of transportation. You can easily fit 10x as many bikes in the same space as a car lane. By building a viable biking / scooter infrastructure you reduce the amount of cars on the road, which more than makes up for the space required by this infrastructure.
Besides, car-heavy tend to be designed quite badly. Planners have a tendency to design for the worst-case scenario, so you end up with communities which legally require a 40-foot wide street in a quiet residential area. You simply don't need that much space!
If a city were to dedicate a single car lane sized lane for “micromobility” and responded quickly to damage to this lane (which wouldn’t be as frequent for the obvious reason that damage is proportional to weight, and scooters and bikes are way lighter than cars), scooters would not be a problem at all.
A city may decide it doesn’t want dockless scooters, but even that problem could be resolved by replacing 1 car parking spot on every street into a scooter/bike dock.