Depends on the public transport network where you live. I used to work with someone who commuted from London to Cambridge (yes, that way around). And in Berlin, someone else who commuted from half way to Poland.

Won't work everywhere, e.g. from what I saw when visiting I don't foresee US cities rapidly integrating enough good public transport to properly replace cars within themselves, and from what I've heard about how municipal organisation works in the US even less so for a convenient and well integrated intercity network, but it can be done.