Random selection was always a teaser that gave travelers a taste of the good life. It's a sign of the program's success that they're not as frequent now.
This is what happens when a frontline of security is manned by temporary employees with zero loyalties to their employer. The TSA needs well-paid, full-time employees, not the kind of ex-mall cops contract work attracts.
Airport security lines may be a little slower if the DHS funding bill doesn't pass, but travelers shouldn't expect major, noticeable differences at airports.