For my feeling, per-passanger screens are relatively new. My first flight with such a plane was maybe 10yrs ago. If the screen space would become free for mount

For my feeling, per-passanger screens are relatively new. My first flight with such a plane was maybe 10yrs ago. If the screen space would become free for mounting own tablets, this would benefit most passengers. By the way, the usual screens are very cheap. The retail price tag would be well below $300. This is a tiny fraction of the mentioned 10T$ per device. I rather doubt that satellite internet can allow 300 people on a plane to stream their high definition videos from the internet -- technically, not even talking about the price tag. A solution (which is already adopted by some transportation services) is to offer access to some in-flight media server.