Mulling this over again.... Here's my advice for Comcast:
GET OVER IT. Give up on trying to support your own set top boxes!
Just support commodity boxes like Roku and generic Android tablets and Android minis.
In the end this will save you a boatload of bucks -
no inventory of door stop boxes to carry, less customer service calls and support calls,
no engineering costs for developing and contracting production of your own crappy boxes.
I hate to admit it, but you could still get some revenue with a monthly subscription charge for each household that
is using a non-Comcast box. Hopefully that will be a very low charge, comparable to the cost of one movie on Amazon or Vudu or Google Play - about $3. Hey, I'm already paying for HBO, Streampix, On-Demand, blah blah blah....