You still need protected lanes in your personal-car-free future. You can't trust bus drivers and delivery truck drivers to not hit cyclists; if anything, they'

You still need protected lanes in your personal-car-free future. You can't trust bus drivers and delivery truck drivers to not hit cyclists; if anything, they're more dangerous because their vehicles are so large and visibility is poor. And don't forget all the exhaust fumes from these things. Even if you make all these vehicles driverless and electric, cyclists aren't going to want to regularly ride inches away from them, just like they don't want to ride inches away from a speeding train even though the train can't easily leave its tracks. Cyclists make mistakes too, and making a small steering error, or hitting a bump in the road, could have catastrophic results in the environment you seem to be promoting. Cyclists need their own road, and until that happens, riding on the sidewalk is the proper place for them.