What becomes useless when everyone starts using it?

1. That out-of-the-way bathroom in the office that no one uses so you can take a shit in peace.
   — VictorBlimpmuscle


2. The back road that is a longer distance, but quicker to use during rush hour.
   — FetchFrosh


3. Loopholes. They get closed.
   — Notmiefault






4. Those "fast pass" things that let you skip lines at amusement parks.
   — Ted_Denslow


5. A beach.
   — henrikose


6. Wi-Fi
   — Hwhiskee






7. The "exclusive" label.
   — e033x


8. The commons. It’s a real tragedy.
   — BillBushee


9. The passing lane on highways - especially when some drivers refuse to relinquish it.
   — Back2Bach






10. A bachelor's degree.
    — AndyJayyRayy