Basically, nobody makes sandbox RPGs like Bethesda's, at least not in the mainstream market.
The degree of role playing and just overall freedom possible in Skyrim is still beyond that of Dragon Age, Mass Effect, Witcher 3, or any other big-budget open-world RPG. A lot of the mainstream audience that got it to like 30 million copies sold probably thinks of it as fantasy GTA rather than comparing it to other RPGs. That's probably what other developers who "want the Skyrim audience" keep missing. I've been thinking recently that the real tragedy here is that no developer has really tried to make a better medieval/fantasy-themed sandbox game. Even if they did, I doubt it would have the immersive sim elements Bethesda games do. Kingdom Come is coming out but that's looks like it's being made with far fewer resources (though much more advanced tech).
That said, Fallout 4 does offer decidedly less freedom in the role playing area.