When you say temporary/negotiated what type of timeframes are you thinking about? There would be many instances where we create organisations to deliver something over a period of time where roles keep changing as the organisation deliivers on its purpose, some roles become redundant and others required, and some will simply emerge from newly discovered needs. I'm thinking for example large infrastructure initiatives where a delivery authority is set up to manage the delivery of an asset then hand it over to someone to operate it or morph into an organisation that does this. No different really to companies working in more dynamic markets where market forces are putting demands on the organisation to change.