Can't say it'll be on the to do list for a while, but you could open a RFE for 'export distribution list membership to csv via the admin console'
-Be sure to explain that the functionality of zmprov gdl
dist-list@domain.com works fine, but you just want it implemented in the admin console.
-A little more work, but personally I think one export button in the distribution list overview that would 'export .csv of all list memberships' would be more useful than having a separate export of each list (you could then chop up your excel file by list).
-Heck you could expand you request to export lists of accounts, resources, etc -.csv exports all over the place!
This is kinda related:
Bug 19157 - Ability to export GAL as a CSV file
Be sure to post your RFE number to this thread!
The distribution list long term plans include:
-a method to 'allow members to see distribution list membership'
-user moderated distribution lists (ie: You give one member user privileges to manage the list's members-not create new lists mind you-that will be reserved for admins & domain admins)
-lists that they can self subscribe too or what's referred to as common listserv functionality (mailman)