Ahh, I see what you're saying. The issue here is that most people have a company's name baked into their email address–so the equivalent for phone numbers would be like me having to dial the carrier name along with the phone number. There is a solution for this problem: give everyone an email address on their own domain, and allow the service "backing" it to be swapped out (this is what I do-I have an email on my domain, but it's transparently mapped to a preexisting Gmail inbox). Of course, the barrier here is that people are used to email being free and easy to set up, while this solution requires a domain name registration (so, around $10-$15 a year minimum) and some technical knowledge on how to set up MX records.