When there are no more bugs that need to triaged out as “no one will use it this way”

When there are no more end users who need convincing that “this is what it is and will be”

When there are no more apolitical voices to be ignored

When there are no more features left to turn into enhancement requests for future releases

When there are no more feasible workarounds left with the legacy product

Meet me there, because that is when, it will be time to “Go-Live”