No matter how TSA handles Pre Check I think it will be the wrong solution. Any plan to add more travelers to dedicated Pre lanes bogs down those lanes. Not adding to Pre clogs the regular lines. And given TSA's apparent inability to schedule manpower where it is needed further degrades Pre.

The vast majority of travelers present no threat of any kind to air travel. Even taking into account the prohibited items found by TSA each week that represents a fraction of 1% of travelers. The obvious, most economical solution is to screen everyone to Pre standards initially then ramping up on individuals as needed.

A top to bottom review of all TSA procedures is needed. If any practice cannot be proven to be effective that practice should be discarded. In particular would be the BDO and LGA policies. Sufficient data has accumilated to show if either of these practices actually improved security. Same for Whole Body Imagers.

Also interesting in the article referenced by OP was the discussion of the FAM program. Seems some people understand just how little FAMs add to security.