More often than not, when I share a link with a client who is not a Dropbox user, they respond to me, asking if I can please share the file with them using a method other than Dropbox because they do not want to sign up for an account. I will then have to send them detailed instructions on how to download the file, because while they can actually accomplish this without an account, the current UX/UI dissuades that by displaying Login/SignUp so prominently in the hierarchy that the small text offering the "download only" option is illegible or otherwise pushed below the fold.
