I think the BGA letter and Paul's reflection of things is spot on.
Re this and similar comments:-
Some (in fact a lot) of glider pilots aren't confident in using the radio; if we can overcome this then surely it's a win win for everyone.
When I fly around I'm sure we might all agree that frankly most GA pilots RT is utter gash. Many struggle with their call sign, let alone the ability to report where they are, at what altitude and the pressure setting they are using.
That suggests to me that they are already at peak capacity so is giving these GA pilots anymore info of further use? Plus we assume we are on frequency and having a basic service telling you "Traffic 2 o'clock, right to left, no height information..." That just reminds you to look out of the window doesn't it? Again assuming we are on frequency..
When we have people getting lost within 10 miles of their home airfield (see another thread) personally I think gliders are the least of our worries!!