Metallica will probably be rocking for many more years, but according to James Hetfield once it's over, it will really be over.

In a new interview, James Hetfield specifically named Kiss and the Scorpions for doing "farewell tours" then not retiring afterward.

"I don’t think that’s fair to anyone.  Kiss [did a] farewell tour for the 10th time?  [The] Scorpions were done, and then they [toured]?  You can’t say that and then not do it."

Meanwhile, Lars Ulrich said he almost quit the band back in 2001, but now he hopes they never stop rocking.  "I don't think I want to do music once Metallica ends.  Hopefully, it will last forever."