Rod1
Like most pilots going somewhere, I do fly straight tracks between waypoints - unless taking photos etc, and I agree that gliders are the remaining issue which is probably un-solvable but they should be visible because they are usually flying random tracks.
Well, one can solve it by flying in or above the clouds; preferably above since gliders sometimes go into cloud.
BGA is the best organised lobby in GA, with solid support among the partly ex air force staffed regulatory bodies around Europe. They may get away from Mode S for a long time.
vee-tail-1
I think lights are a good idea but they need to be really bright. The U.S.-made gas discharge lights are great (very bright, lower power usage, almost indefinite life) but appear to be difficult or impossible to fit to a G-reg other than a homebuilt.