It's a very slow progress. Boston has been making tons and tons of progress over the last few years that impressed me but any benefit public derived from increasing bike lanes, safer bike lanes etc were essentially undone by the absolute unspeakable clusterfuck public transportation became (frequent subway closures due to maintenance, practically unusable bus service due to disgusting amount of traffic, no investment etc...). I am hopeful things will improve steadily and Boston will be a European-lite city in USA in the next decade or so, but I might be too optimistic. It's relatively practical to bike in NYC and Philadelphia as well. I personally enjoy biking in NYC but many New Yorkers complain about safety, which makes sense given how chaotic and aggressive NYC traffic is, you do not want to be a meat pie on the road. We have tons of more progress to do, not enough investment into this because 99% of Americans who don't live inside a major non-driving big city don't give a shit about non-car transportation.