A more radical solution is to find new sources of commercial revenue within the terminal, and this has been explored by many airports over the last decade or so.

When all MQInput nodes have sent their last message the last of these is propagated to the Finish File terminal causing the file to close.

Of course, this doesn't solve one last problem: the starting non-terminal expression has nowhere to return to, so you will need to do something with the values it produces.