Some may know, or not, of th 819-line TV systems adopted in the likes of France and Italy, an early form of high-definition TV system almost if not quite coparible to the modern standard, at least with the System E sort which suffered from the fact that it ocupied a VHF channel bandwidth of 14MHz (as opposed to System F used in neighbouring coutries using only 7Mhz bandwidth). Of course this does mean that there are bound to be fewer possible stations broadcast on the available bandwidth and it is probably less than practical for analogue terrestrial TV- the standard even being abandoned in France in the '80s at the latest in favour of some form of the more common 625-line standard.
So the challenge is: make 819-line standards somehow more widely accepted, or introduced more widely as an early high-definition standard, if only on cable or satellite. How posssible is it?