While I admire the intent, I can definitely see bad developers simply writing long functions in multiple "parts" to get around the system.

  public void shittyLongFunctionPart1(...) { //First line of screen 1
  ..
  ..
  shittyLongFunctionPart2(...);
  }//last line of screen 1

  public void shittyLongFunctionPart2(...) { //First line of   screen 2
  ..
  ..
  shittyLongFunctionPart3(...);
  }//last line of screen 2

Yet another example of culture trumping process. At the end of the day you need developers who give enough of a shit about their craft to write readable/testable/maintainable code. And that sucks because it seems relatively rare.