Since switching over to the new sandbox its use has been dominated by two users. They have proposed a number of questions that have been negatively received. Many of these questions have either been pointed out as being probably a duplicate or have suggestions of how to modify the questions to a form that would be better received by the community.
Instead of making substantive improvements to their question, the users move on to proposing a new question with many of the same problems as their previous question.
What can we as a community do to encourage more productive use of the sandbox?