Caleb Tiller of the National Business Travel Association said, "It's not entirely clear why we need a reservation system to deal with peak times rather than adding TSA staff and (checkpoint) lanes."

I agree....

Why does the NEW kid(s) on the block decide they know more about the airline biz then the airlines.

I've seen them (TSA) shut down a checkpoint because they couldn't staff it. How would that work with a reservation system.

What about the Disney World Fast Pass System!!

Disney's FASTPASS® Service
Take advantage of Disney's FASTPASS® service. You can enjoy the rest of the park while FASTPASS® saves your place in line.

To use Disney's FASTPASS® service:

Look for the FASTPASS® distribution area near the entrance of an attraction (check the complete list of attractions that accept FASTPASS® below)
Check the FASTPASS® “Return Time” display which gives you a span of time during which you can explore the Park before returning to board the attraction.

If the Return Time is sufficient for your plans, just insert your Disneyland® Resort admission ticket, readmission ticket or Annual Passport into the machine.

A FASTPASS® ticket will emerge with your Return Time printed on it. Now you're free to go and enjoy the rest of the Park.

Go back to the FASTPASS® Return queue when your return time rolls around, show your FASTPASS® ticket to Cast Member at the entrance, and enjoy the attraction with a minimal wait.