Regardless of how smooth the manoeurve is, TCAS is still an emergency procedure.
The interesting point that Dick missed, was that the Lancair pilot had the Virgin jet in sight, yet couldn't determine in time or ajudged his current vector would not be a problem.
It was probably the former. How the hell would the Lancair pilot have time to determine if a collision risk exists, then have the time to maneourve his aircraft to avoid the collision. He had possibly less than 30 seconds to do all this. Sounds like any manoeurve he might make wouldn't be too smooth.
The other point, which has been made previously, why does Dick want this type of separation problem in the hands of the least experienced and capable person to resolve the conflict and take this responsibility away from ATC who have a better picture of the conflict than any pilot involved. Thats why we give ATC radar!