[Flenser]

Once you have an Apple TV you're locked into the Apple ecosystem for as long as you have it. You'll buy lots of tablets and phones during that time that act as interfaces to it.

Also: http://i-want-a-pony.com/

Edit: Apple are probably the only company that could make an 8k TV and have content ready to watch on it, or at least they are in a position to have have a product ready before anyone else. They could manufacture them at scale to make a decent margin selling them at a premium whilst locking consumers into their ecosystem for years to come.