My word what utter drivel you post! A hypothesis that might be useful? To whom? All it would do is ground the entire air transport industry.
"Got two packs boss but one is U/S, MEL says we can go with the other".
"Not any more you can't. Redundancy is not to be used for commercial purposes"
And what is this nonsense about BA trying something with an A380? Do you think there will be any substantial difference between flying an A380 on 3 and a B747 on 3?
Such a ludicrous policy would not 'give credit to those who are cautious', it would give credit to those who operate twins over quads, which is the whole point of the FAAs machinations. The airlines who operate quads are already more cautious by having twice as many engines as the twins. Where's the credit for that?
Anyway how come you now include yourself in Europe? The UK FTLs are far superior to the USA ones which allow crew to be flogged for hours on end. Remember the Little Rock accident. If the USA want a standard block of FTLs then they are welcome to use our safer ones.