What happens to a dynamic distribution list when a user leaves the organisation?

We have a bunch of dynamic distribution list created by different people in our organisation. One of these is going on maternity leave soon and hence her SugarSell license will be deactivated. However, we would like to continue using the lists the person created in Market. 

Since there is no functionality to edit the lists someone else created how can we make sure that we can use these lists in the future? What are your suggestions if we would need to create new ones to not run into these issues in the future?