As I've posted elsewhere, I think Neffenger is going to justify the long lines by greater attention to security instead of 'customer service' - then he's going to ask for $$$ to greatly increase the number of non-working staff hanging around open checkpoints instead of staffing closed checkpoints.

Besides, if people keep hearing about the limited and unpredictable availability of Pre, the multiple and unpredictable 'flavors' of Pre, and the long lines in Pre (see one of the recent photos posted on @AskTSA), I can't see them rushing to sign up.

Slightly OT: @AskTSA's completely tone-deaf comment on the photo complaining about the enormously long Pre line was that it's an expedited experience, so the line will move quickly.