No, but it should be. And Apple is trying to kill it.
It's rough now, but in 2 years most cell phones will have e-mail...even ones without $30-a-month data plans.
Once that happens everyone will say "I can't believe we used to pay for text messages!" And the world will be a better place.
But it won't happen until someone takes the plunge. The iPhone volunteered, and I wish it luck.
How do you think some phones will have email access without a data plan? I don't mean that in a condescending way, just curious. The only reason that I can think MMS wouldn't go away is because phones that have email now currently need an expensive data plan. What might be some future options so that people don't need the expensive data plan?
Without a cheap, or free, option for email then I don't see MMS going away.