There is one big problem with identities as a solution: https://lastpass.com/support.php?cmd=showfaq&id=8846
You cannot see shared folder entries unless you are in the 'All' (default) identity. So, I have a few dozen active sites I share with my wife, and use regularly. But to have them show up normally, I have to see sites from all identities negating the usefulness of that as a solution.
I wouldn't care which problem was fixed. So +1 for archive, or +1 for shared folders in identities. Right now -1 for ignoring your customers.
And don't let me get started on switching between enterprise accounts.