Perhaps, but I think of it like this: when I'm leaving home/the office, sure, I have no problem finding a printer and doing OLCI and being done with it. But when I'm on the road, it's always been a concern to think about which hotel has free printers or can I send the fax to, and will it arrive on time (if I can't get physical access to the fax machine and must rely on the hotel staff). Same thing if I'm staying with friends/family: another thing to be concerned about and I don't like to trouble them to use their printer.

Nowadays, nearly everyone with an Internet-enabled phone is paying for unlimited data access as well, so this is a great convenience and time saving method. Of course, it's not implemented systemwide yet, but eventually I hope it would be.