Blockchain will not touch it unless they change their terms of conditions for dormant accounts with less than 0.0000xxxx BTC will be closed and give owners ample time to move their funds somewhere else.
I dont think they will ever do that other than incase they lost the json files associated with every user account from their server which is quite unlikely.
Also when we have passpharse from blockchain can't we just move our addrress to another wallet provider?