There should be an ability to set a quota for total complete or incomplete responses to a number
After the quota has been reached the survey could be expired

As the admin for a large limesurvey site i often create surveys for other people but then make them the administrator of the survey and assign them the rights to access the survey
In the survey list i still see all the surveys i created for these people although i am not the administrator, i am the "creator" of the survey
If I could transfer it to the actual administrator of the survey i could find surveys better