The perception of Apple customers has been that they're typically left of center. Apple haters fired the "your iphone is made in a sweatshop" volley (legitimately, I might add) because of this perception of Apple's customers and an attempt at shaming them. Apple responded by enforcing ever stricter standards of minimum working conditions on all their suppliers, thus safeguarding the customer base. Continuing along the same lines and in service of safeguarding their customer base, Apple started moving towards green energy also because that's yet another selling point to keep their customers hooked. It's also the reason why in every product launch, the greenness of the product is a feature touted alongside its technical merits.
Customers give Apple money in exchange for Apple products. That's how Apple became valuable enough to have so many shareholders. Take away the customers and you're holding a shell. The customers *want* a company that is at least a little altruistic because it makes the customers feel good about themselves.
If shareholders treat Apple like the goose that laid golden eggs, they'll suffer the same fate when they try to distil the company to the essence they (wrongly) perceive it to be.
Just the Doctor
controlling your TV might not be one of them. It typically uses your TV as an output device and that's the extent of control it has on it. You could look into using an irblaster in conjunction with your frontend to exert more control via scripts that can be tied to your remote control using lirc but that's something you'll have to build yourself. It's more common to use an irblaster for channel changing a cable box for which mythbackend already has support.
I'd say pick whatever TV works for you and ensure your frontend can handle decoding and playing full HD content. Add a universal remote to the mix and you have the makings of a killer mythfrontend. If you'll have a separate backend (which is what it seems like based on your description) you won't have to touch the backend at all.