The news that up to 7 million Dropbox usernames and passwords may have been compromised is a good opportunity for businesses to review their use of multi-factor authentication for the online services that they rely on.
At this stage the Dropbox leak appears to be a result of re-use of passwords on multiple sites, not a direct hack of Dropbox itself. It is unfortunately quite common for individuals to sign up to different online services using the same email address and password.