I assume that text messaging is targeting the high school crowd.Typing out a joke on a cell phone, whether or not it gets used in the show, is not what I consider interactive. As wannab said, I assume they will have other ways of getting "inta the act." I think being able to shout out something and have Mike respond to you during the show (assuming that can happen) is better interaction.
I have the feeling hecklers will be dealt with in very humorous ways, similar to other standup acts.