Class G operates and relies on the requirement to "see and be seen" in order to comply with the right of way rules.
I've not yet seen or heard of a drone that can do this. It's one thing to issue a NOTAM when these things are being flown (which seems to happen now, quite rightly so), but if they are to be used on a far wider scale, the associated NOTAMS would become so plentiful that they would become ineffective. This is the present situation with regard to the increasing multitude of cranes in the London area. Surprisingly, since the tragic accident on 16th January this year near Vauxhall, every man and his dog seems to be using ever taller construction cranes. It's now impossible to plot and avoid the NOTAMed areas in any meaningful way (especially when SVFR clearances send aircraft straight towards them).
As helicopter pilots, going about our lawful business at relatively low altitudes, we are more likely to come into closer contact with drones than other airspace users. We need to be protected from the further danger of coming into contact with "blind", non-compliant drones.