Wouldn't this be "self fixing" problem, if you use 1Password to comeup with a secure Dropbox password?
Obviously this isn't ideal situation, but I see no reason to switch away from 1Password and currently I don't even know where I would go from 1Password. I jumped from LastPass to 1Password since I want to have access to my passwords on mobile devices without paying a yearly fee and now that LastPass has been acquired by LogMeIn I'm in no hurry to jump back. And I don't know if opensource managers like KeepPass have mobile support.