S-T
1. We are trying to tie the timelines. help us.
2. My perspective supported by all (reasoned, not you zop-zit) argument on here suggests that NAS is only a problem in E, not C. So my next answer to one of your questions is an out of context phurphy, but here goes.
3. Only the good old US of A has decided to go its own way. Other aircraft should be compliant. Answer to that, tell em to come in they have to be compliant. (a $5K box represents less than .001% of a 747, it represents upwards of 15% of an older PA-28).
4. NAS with ADSB is a good solution, in my view, for the guys in D abnd below. But you ('they') will never manage to mandate Mode S systems below (say) 8500', so to get it for all of us we ALL need to push it.
AK