TES had it's great moment with skyrim. You know the got some mmo out afterwards? which flopped and is still fighting against death by disinterest? See the problem and their greatest advantage is, they don't really have a sotry or a world which shapes it around it. The disadvantage is however, that they won't be able to top skyrim. It already did everthing anyone wanted, so don't expect TES6 to have such a large impact. well they could introduce an epic story, but we're talking about bethseda here