Blizzard should add the ability of socketing items in game
maybe a large quest like "the staff of herding" where you have to hunt for "the socket plans" or something like that, also there should be involved the use of fiery brimstones in this quest.
and yes you should be able to socket any item.
but any item that you socket doing this it became account bound.
I think that would be a great Item sink.
what are your thoughts?