I think they should have a larger responsibility than that, but yeah I absolutely agree that once devices are no longer "supported", the manufacturer should be required to relinquish control to owners in a safe manner (e.g. Android unlockable and relockable bootloaders).

Same goes with multiplayer game developers. If they wanna stop hosting servers, they should be required to release the server software in a manner that makes it possible for me to set it up for myself to keep playing the game.