Nope, still not something I would consider as a customer. I use SMS for short on-the-run bursts: "landed", "running late", "call Fred ASAP", "baby boy 8.5 lbs.", etc. The thought of doing commerce over SMS has no appeal for me. And what the carriers charge for text is highway robbery. I don't want to use my monthly limit for ordering pizza which could take 4-5 messages.
The number of smart phones users with data plans is skyrocketing. Even in the relatively small, semi-rural are I live in, everyone I know has a smartphone with data.
If I had a pizzeria, I would create a simple app (iOS, Android, and Windows Phone 7) that would be free. You would get a free small pizza on your first order - which is where you would register your information. I could build a database, offering you specials based on your past orders or whatever menu items I want to move - depending on the time of day, what's in the queue, etc.
If I were a pizzeria operator, I would prefer to invest in this approach rather than a stop-gap for an old business model. But what do I know?