The denser areas, especially the bay side belt are quite are quite bike friendly.
Public transportation is a completely different question, bikes on buses do not work, some train services can be adopted with special carriages to carry bikes on board.
The main issue isn't just roads its and entire infrastructure, e.g. giving bikes priority over motor vehicles like in some European countries which might not work well, In many cases bike lanes tend to also have a negative impact as they are often take spaces from public side walks, you can see that being a very big issue in some European cities that went bike crazy.
London is trying to do that and it's infuriating bikes seem to do what ever the fuck they want they'll go in the bike land but on a red signal they'll decide to go over the cross walk and onto the side walk to get a head, they often go into red signals even on the road when there is no (or they think there isn't) incoming traffic, and they clog bus lanes.
You can't just go from 0 to 60, turning SV into a bike friendly zone will take as much time as it took to turn Copenhagen or Amsterdam into one.
Why do bikes on busses not work? They have this already, as well as bike storage on the regional trains.
Do you have a citation for bike lanes digging into sidewalk? I've literally never heard of that, especially in the US where sidewalks are never near bike lanes and separated by a curb/parking/grass.
The usual way to carry bikes on a bus is on a shared horizontal rack at the front. The problem is when someone gets off, their bike is invariably at the back, and so they have to remove all the bikes stored later, get their bike off, and put all the others back on. This takes many minutes, which makes it infeasibly slow for commuters.
A better rack design (hanging vertically on the rear?) could solve this.
London has a long-standing culture issue because, for decades, the only way to get across the city safely by bike has been to ride aggressively.
You say "you can't just go from 0 to 60". That applies to bike culture too. As the segregated lanes are put in, London's cycling culture will become calmer, just as it is in Copenhagen or the best Netherlands cities.
