Texting from the servers to international cell numbers could incur quite a cost, couldn't it? I know from England if I want to text a friend in Sweden it's almost £1 ($1.60), and despite the fact that I'm not on a great calling plan - international costs never seem cheap.
I'd go along with it, I just hope that implementing it wouldn't mean that donations were mandatory.
Trying to think how often I get a client crash and have to log in again (+1 text message). If costs stay low, it can't fail I guess... the goal is a noble one, I've never been hacked but I wouldn't wish it on anyone
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EDIT: And for anyone with privacy concerns, your passport contains a tracking chip in it (that thick page)... I think giving out your cell this one time is a minor grievance :P