Arnold made a mistake. Should have done what the rest did.
Arnold tried to make his 1st comeback with an unknown project. No idea what "The Last Stand" is, the character, or the story.
When Bruce Willis made his comeback, he did a new DIE HARD. Brought back his signature franchise. Built in audience.
When Stallone came back, he came back with a one-two punch (pun not intended) of Rocky AND Rambo. Two of the most famous film franchises of history.
Arnold should have just came back with a new TWINS 2, or Kindergarten Cop 2. Even a new PREDATOR, or a sequel to Running Man.