Tens of thousands of people are finding some use for it, even if it's just novelty.

I could imagine yo'ing my wife to say "Thinking of you" while at work, or my brother to say "Not up to much if you want to Skype", etc.

I think they could easily start with something curious like this and then slowly extend it to something else (e.g., single word/term conversation elements where you get more choices the deeper the conversation goes).

How many naysayers were there (and still!) with something like Twitter? Yet I use Twitter many times each day.