A box that connects to the telly, gives you an online television experience, and also acts as a home server for families, couple, etc where you don’t want partitioned and separated content but rather, all of your household’s content siloed and synced. Such a home server would also be a significant step up from the mere Time Capsule concept. Also, because people often have more than one machine, a way of syncing everything from your account on one machine to your account on another, by having it all live for real on the home server —*if you’ve got the same content across more than one machine, only back it up as if it exists once. Same with other members of the family.
Their ridiculous mobileme thing should be made quite well functional at a free level, and only start skinning your bank account for higher levels of usage. An improved and free first level mobileme should integrate quite well with a home server.
They also need to realise that families or couples etc want some of their content shared (ie, exist once but available to all) and some kept private. If they can pull that off, then iPads etc can be less personal and more share-able.
A home server that gets all of these concepts right would be a superb product.