TBH, i think this is rubbish, and will probably be stopped, as the americans can now launch missiles at everyone else without fear of retaliation, as they can just shoot down return fire. This will provoke a "well, we might as well fire them all now response from terrorists, cause we cant do it later" type response from terrorists and conflicting superpowers aswell. IMHO bad idea
IMO its a good idea, 9/11 devastated so many people, now they struck london, we dont know where there gonna strike next, this is just a matter of safety.
As a pilot, these descisions effect me greatly.... I think the new system will make airtravel safer, but will also but a large financial burden n the industry.