What would make the Apple TV the must have smart hub for your TV? Not much since all the amazing things it would do would be limited to those owning Apple products. IF one could run a Mac, android or windows app on your phones and tablets and computers that would connect those devices in ways that are compelling, that would be something. But apple doesnt play ball like that so Apple TV will be just as annoying as it is useful. On mine all the entertainment I get from it are from non Apple apps because there are too many hoops to jump through to do so. They keep doing it that way and they'll just build a user base who will avoid such a product by the time they upgrade again.
The Apple TV is barely integrated with the Apple ecosystem as it is. Take home sharing for example. It has NEVER worked right on the Apple TV. Take song play counts. They NEVER synch from Apple TV to desktop Apple Music. I can go on and on.
Apple needs to nuke it and start again. A genuinely good Apple TV would absolutely prompt most current owners to upgrade. As it stands Apple TV is no better than ROKU or the typical smart TV. It’s lame.