this post is London-centric:
Distance is an issue for sure - people live increasingly far out in London, as they've been priced out.
I just googlemapped my commute, door to door 2 hours a day by train, zone 4 to zone 1 - but thats only 12.5 miles by bike - I can do that, maybe up to 90 minute max bike ride each way.
But what does that ride include? Several large hills and lots and lots of dangerous roads - the entire length of the old kent road in my case. And lots more beside. And tbh 90% of roads are dangerous in London. And fuck biking in the rain. And turning up knackered and drenched in sweat after that. and riding in the dark. etc etc etc
It might work for a small percent of people not already commuting by bike before this situation - like i said 5% would be very impressive - but this transport issue is a hurdle I cant see any way for the state to jump