This is an interesting thread. SLim_slag when you talk about no TCAS for GA you seem to have forgotten SKYWATCH equipment that is in the SR22 etc. That is a traffic avoidance system that anyone lucky enough to be in a SR22 can use and that is based on SSR (mode s or c) I personally think that when ssr has been around for over 60 years in one form or another, perhaps we should be looking at it as away of enhancing safety. After all you wouldn't fly without using a seat belt, why would you want to fly with out something that could stop you being swallowed by a turbine engine or chopped by someones prop?
Stands back and watch the flames