Say that we started doing what you wanted today. That we could get from A to B in a few decades.
So what happens in between? Does society stop? People stop going to work? Stop going to the grocery stores?
Or do we keep burning fossil fuels?
Not everyone lives in a densely populated area. Not everyone has a grocery store within walking distance. Or biking distance.
We are where we are today. And that's where we'll be tomorrow, next week, and probably next year.
Again, what's the plan for the transition?
Something concrete please. Not vague talk of "solutions" and "tweaks".