I'm fine with it just in general. If they can make an AI that does a good job dungeon mastering it's going to open up the hobby tremendously. New players can jump right in even if they don't know an existing experienced player to hold their hands, the "forever DMs" can be free to play too, groups that just don't have any DM can play.
If it's bad at DMing then nobody will use it. Oh well. If human DMs want to DM, they can do that too. It's just the same as with the art AIs, the existence of these things doesn't stop people from still doing things "by hand" if they want to.