Let me shed some light on this. Not everyone with a TS clearance has access to TS information. The majority of TS material has further classifications attached to it, which require further checks, and verification of "need to know." It's called compartmentalization. So of that alleged 4 million cleared people, very few EVER see any TS material. Those that do only have access to the information they actually need to do their jobs, or very specific "compartments." The people at the NSA likely do not have access to much of the material an Air Force intelligence analyst does, and vice versa.
I worked at a command center on a deployment, I held a TS clearance, and the mission I worked on had certain aspects classified at the TS level, and I still wasn't allowed to access it because my specific job did not require it. This is the case with probably 75%, if not more, of the TS clearance holders.
Take off the tin-foil, guys. When I start wearing it, then pull the hats out.