Airlines have found over the years that the handset controls are not very reliable, have a habit of being ripped out of the seat etc etc. touch screens apeared to be the answer, but are showing a new set of problems allready identified here, ie annoying the pax in front, not enough angle on them when reclining the seat, etc etc.
Best thing is vote with your feet.!
For info I have seen these screens on Jet airways, VS