I for one hope this plan does not come to pass. This smells to me like El Al security and I don't think that TSA or any local airport police are staffed sufficiently to actually carry this out in an effective manner. I'm an introvert by nature, and I don't like answering questions at the airport either.
And, it is difficult NOT to racially or ethnically profile when the majority of hijackings/terrorist incidents have been perpetrated by one or two ethnic groups. Realistically, I don't know of any elderly people or young children carrying out any sort of nonsense, but to be fair, they would be targeted by this as well.
I hope our leadership making the decisions thinks long and hard before implementing a plan such as this. I've watched too many of our civil liberties erode in the last few years in the name of national security.