Blaming Alinea's pre-paid ticketing system is such a lame cop out. Many (if not all) restaurants of a similar caliber have cancellation policies and will charge a diner's credit card for cancelling late or not showing up. If this couple would have had a reservation at Grace or even Schwa, an unreliable baby-sitter would have put them in a similar bind.
My one question in all this, is did this couple attempt to contact Alinea at all and explain their predicament? Maybe Achatz and co. are heartless misers that would have told them to take a long walk off a short pier, but my hunch is that this is not the first time extraordinary circumstances have prevented diners from attending and that Alinea would do their best to accommodate or make other arrangements given the circumstances (I could, of course, be completely wrong about this).
So, the baby-sitter cancels and the couple makes the decision to bring the baby with them thereby inconveniencing other dinners. Whether it's Alinea or Denny's, such behavior is blatantly inconsiderate, and I'm saddened (but not shocked) at those attempting to rationalize or defend the couple's actions. Sign of the times, I guess.
(Alinea is not blameless here. It sounds like they were caught off guard, and did not handle it in a very deft manner).
"This is the violet hour, the hour of hush and wonder, when the affections glow and valor is reborn, when the shadows deepen along the edge of the forest and we believe that, if we watch carefully, at any moment we may see the unicorn." Bernard DeVoto, The Hour.