Eventually they will just force everyone to do this retina scan thing if they want to get through the line quickly... it will be the newest "step" in security procedures. I'm sure this will just be the beginning. It will start like the EZ-PASS toll booths... by just being one or two lanes for these "enhanced" security measures, but then they will force it upon us by directing more and more of the regular security lines to these "enhanced" lines... so instead of 4 regular security lines and 1 "enhanced" one, there will be 4 "enhanced lines" and one regular line.
Basically, frequent travelers will be forced to get in the "enhanced" line, otherwise be hopelessly delayed in the one line that allows you to enter security with retina scans.
So much for privacy in this country... oh wait, that went out the window with the Patriot Act

More power to the government, less freedom to the people!