Having Amtrak supply video equipment and content to the bedrooms would be a big expense. First, there's the cost of the equipment itself, and the inevitable servicing needs due to misuse and breakage--not to mention the issue of theft that apparently occurred when this was done years ago on the Viewliners. Then there is the not insignificant cost of the licensing of the content--which would be a continuing cost as the crop of movies and television shows got stale. And consumers would demand a lot of content, which would translate into a lot of licensing fees. (Airlines have learned this to their sorrow, and it is one of the things pushing towards the elimination of airline-provided entertainment systems. Then there is the matter of SCA time spent troubleshooting equipment, teaching folks how to use it, etc. (Ask a flight attendant what the number one use of call buttons is on international flights and they will confirm, it's problems and issues with the entertainment systems.) And, if they were to be retrofitted into the Superliners, where would you put them? Maybe in the space above the chair? But that would mean you'd lose a prime storage area--which the bedrooms are not richly supplied with to begin with. With all that attendant expense, wouldn't bedroom prices have to be increased to cover it? Or would coach fares go up to subsidize the entertainment systems in the bedrooms?
Seriously, there is a simple solution--and one which ensures that each passenger gets exactly the kind and amount entertainment that they prefer--download your desired entertainment before you board. I would guess that just about every person who can afford traveling in a bedroom already has devices like smartphones, tablets, or laptop capable of serving their entertainment needs. And I would not want to pay extra for my bedroom to subsidize the entertainment needs of those unable or unwilling to supply their own. Rather than spend the money on that, I think a better upgrade is to make the HVAC system work more efficiently, or in some instances, just plain work.