Unfortunately, until there are mobile clients (using either Dropbox or git, I suppose), it's kind of a non-starter. I spend too much time on mobile devices now to not have that be a primary consideration. After using Keepass+Dropbox, I won't go to anything less convenient (and the problem-space doesn't intestate me to build a solution).
I saw your other comment. Unfortunately, there is at least one, very large, platform where the terminal access is not really an option. Does Windows mobile OS provide terminal access?