There is a lot of moonlighting. But however telecommuters are counted, it's not a sideshow anymore. Electronic communication has hit critical mass. There was a time when the small population of fax machines and personal computers limited the potential of electronic communication. Now it's no problem.
Business cards are now crowded with extra lines of phone, fax, and e-mail numbers.
As a result, distance has become irrelevant and you can get near instant communication. Problems, even small ones, can be solved very quickly. The result is more productive interchange regardless of distance. While many people will say that direct, face to face contact is essential, I believe they are overlooking the intimacy of phone conversations. And it keeps shrinking.