So let's see if I understand this as far as the "measured mile" being a moving target and adding an aspect of safety.
I have a car that can go faster than anything ever built before. I have a course with 10 miles of good, hard, flat ground. At one end of the course is another 20 miles of flat, but soft or not so good ground. At the other end of the 10 miles is a sheer rock face with a public road running along the bottom. I can find no other practical course at this time. Also, my car can "safely" run up to top speed in 7 miles, and stop in 2 as long as nothing goes wrong.
With the current requirements there is no way that I can possibly make a safe return run, because I have no emergency run out area. I have all the room in the world to run in the direction away from the cliff, however. I can make one down run, tow back to the start line, and make another run to backup and verify the performance, but it won't count under FIA or FIM rules because they require runs in opposite directions over the same measured mile.
This means that given the performance parameters of my theoretical car (7 miles to accelerate, one mile trap, and then sufficient emergency run out room to stop) I would need to find a course that is at least 15 miles of good surface. The new organization's rules make it possible to run on a 10 mile course vs 15. The extra time allows for a tow back to the start line and safe preparation for the backup run. Seems like positive things to me.
I know some folks are going to have hurt feelings because they feel like their toes are getting stepped on and their kingdoms are being challenged, but really, that's a constant progression of things in the world. Fight the status quo, change it, or go around it and let it catch up. The sun comes up tomorrow and we try again.