It created a great dynamic when the Ponds would come in and out of the Doctor's life. Martha also had this opportunity. Of course, River Song is a new classic! I'd like to see Clara have an arc that she could come back or bump into the Doctor at some later time. Maybe even a dynamic like Rose had with Sarah Jane. Though it is SciFi and nothing is written in stone, killing her off would really make that difficult.
Clara has had enough tragedy in her arc with the Doctor, she would benefit from a happy ending.
See you earlier!