t9 app..?

Okay so this is probably wishful thinking, but I love everything about my iPhone apart from the keyboard! I hate it! I'm even jealous of my friend who has a 5800, texting is so much easier with t9 (for me, I know some people hate it!!).
Is it feasible that someone might some day create an app that lets you text with a normal phone t9-enabled numberpad..?