There are very good points made here. 1. it is boring if tributes are stuck somewhere and have to wait for death by starvation or a very observant tribute finding them. 2. it would need some kind of restriction on to when the DM could be initiated, otherwise matches wouldn't be enjoyable to play as they would be cut short (could this be countered by the live tributes then having the vote to continue with the DM?) 3. if an alliance is hunting a single player then i think the DM should be initiated by the live tributes, because they would stand no benefit to kill the lone tribute and then continue playing without killing each other.