Shot One,
You're quite right. We don't know the answers to those questions - a lot of research and 'beard stroking' is going on to try to do so.
An RPAS does have lookout in normal operations - in many cases potentially better than a FW due to the nature of EVS and TIs. The main issue is trying to define the equivalent artificial lookout to that of the mean aviator. In RPAS this is a reversionary mode assuming the link has been lost and LLL is in effect - for fully autonomous systems this will be vital.
It wasn't my intent to disparage civvy lookout - there are plenty of examples both side of the street of poor or compromised lookout either by over-reliance on navaids or poor design (Tutor canopy arch for example). The problem is that if a RPAS collides with a GA or glider it will invariably be the RPAS that is blamed. RPAS are potentially a revolution in military affairs -we need to be careful that we are not compared to 1930s 'gun club' admirals attempting to defend their 'traditions' by besmirching new ideas and technology.