Scenerio 1

Ethereum returns the ETC funds to its rightful owners. This causes an increased supply of ETC and therefore will most likely result in greater selling pressure. Most DAO holders will most likely cash out of there ETC position driving the price to the ground. Ethereum will no longer have a legal thorn by its side and can move on.

Scenerio 2

Ethereum Devs decide to keep the ETC. This proves Ethereum team can't be trusted & ignites a whole range of legal issues.

Scenerio 3

Ethereum Devs decide that they will not move the ETC and dispose of the private keys. ETC is now more scarce than Ethereum and they still have issue with legality of the whole thing.

IF the thief is able to have access and move his funds, why would the Ethereum team be reluctant to compensate honest DAO investors. ETC is now listed in all the top exchanges. This rash is not going to go away.