The third criteria isn't accessible outside of Microsoft, and is the conversion rate, i.e. the percentage of demo downloaders who end up buying the full game. As we don't know what games have good conversion rates, the games on the list are therefore not absolutely guaranteed to be in danger. But if there are any on the list that tickle your fancy, now is the time to try them, as they're the most likely ones to leave the Marketplace.
Full list after the break.