Interesting post, thanks and there is a lot to agree with. Tgere is a clear fall in standards of technique, combined with a significantly more aggressive outlook by batsman which does increase the likelihood of someone being hit in the head.
I have played at Div one level and got peppered. I have also played on terrible pitches at a much lower level and seen bouncers bowled. I haven't seen a reduction in people trying to bowl short!
As for the neck guard argument, I was a late adopter to wearing a lid and probably will at some point buy a neck guard, but haven't gone there as yet.
I have fitted one to my son's lid so he gets used to it before he knows anything different