Changing the Main Super Admin to another existing extension
It will be easier if there's an option to switch the main super admin on the account to another existing extension, instead of moving the information from one extension to another or moving the direct number. Since there are some important messages that need to be kept from the old extension of the user who will take the place of the main super admin since there's no option yet to move the messages or inbox from one extension to another.

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Jason commented
It's also ridiculous that all unassigned numbers rings to the Default Super Admin account and no way to change that or the Default Super Admin to another user or account. So who ever signed up for ring cental, will get calls (they're not the receptionist) and if someone leaves the org, can't reassign it to the new administrator or account holder. Since SCIM provisioning requires unassigned extensions with a license to provision, can't add unassigned extensions to a dummy account. Then SCIM will fail.
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Jose Espedido commented
It will be easier if there's an option to switch the main super admin on the account to another existing extension, instead of moving the information from one extension to another or moving the direct number. Since there are some important messages that need to be kept from the old extension of the user who will take the place of the main super admin since there's no option yet to move the messages or inbox from one extension to another.