For any common purpose key delivery is trivial. This is the electronic era - there is no reason not to make the pad very large, and at some point in time you are very, very likely to have met anyone you wish to communicate securely with in meat-space. Ebanking? pick it up when you set up your account. Corporate networks? HR can hand it over when you are hired/promoted. It isnt like you have to constantly get new keys! A single memory stick pair will cover all your traffic needs for life.. or at least until you forget to take it out of your pockets before washing.