A first step would be to prohibit BlackBerry use during question period, as has been done in other parliaments. If members make the effort to get up and go to the lobby, and that becomes widespread, then we would have to change the rule. It's somewhat like with children. Parents will begin by imposing one form of punishment as a result of bad behaviour, and if that fails, will impose another. I don't think we should get too caught up in all this.
Your example is quite striking, but if each member left their seat to use their BlackBerry in the lobby, there would be no one left in the House. It would be just as well to suspend the sitting. I cannot help but think of the consequences of such a situation. If there was a prohibition and people went out into the lobby to send their messages, then that would lead to operational problems.