This debate is a bit of a farce, as usually happens when pilots are asked for their views on transponders.
The reason we are getting mandatory transponders is not to avoid GA-GA mid-airs; they are already extremely rare and anyway very few owners are able/willing to spend the £20k+ on the other half of the TCAS kit.
The reason for transponders is to do with separation between GA and commercial traffic.
I think it would be nice, one day, if the TCAS price came down but it isn't likely to come down much unless the decrepit GA fleet is scrapped and replaced en-masse, which isn't likely
And then people on PP will still be posting messages saying that the Mk1 eyeball is the proper way to detect traffic.