The reason why a member cancels his/her membership is invaluable information for a creator, and allows for us to evolve with the proper real time feedback.
Adding the option of requiring a breif survey asking the member to choose a reason in order to process the cancelation.
A method that is widely popular for online membership platforms.
Could even be implemented as a simple redirect to a form page as a member clicks on cancel.
I Hope this could be done soon.