End Of The Line Meaning

(idiomatic) Final cessation or discontinuance of a process, institution, or person, especially one which has existed for a considerable period of time; death.

Example: The termination point of a railway or similar transportation system.
1898, Gertrude Franklin Horn Atherton, The Californians, ch. 26:
  Sometimes she took the cable car to the end of the line, then walked to the Presidio.
2008, AP/Matthew Rosenberg, "Nepal Prepares for End of Monarchy," Time, 5 Apr.:
  Gyanendra's 269-year-old Shah dynasty has reached the end of the line.