Leadsled,
Thanks for the response.
E, for me, will never provide me any assurance whilst ever there are aircraft ( mainly VFR ) operating without the same level of situational awareness, particulary WRT IFR waypoints and be on the correct frequency.
C, well everyone has to have a clearance and is separated, pretty simple.
If all aircraft were ADSB-out, sure E might be a go'er, but lets not ignite that little gem.
I'm just wondering, would you seriously see anything other than full separation as acceptable ?.