I think blank fire is an awesome element, but would only like it in games where 18 was the absolute age minimum. Those turds wouldn't wear ear pro no matter how many times they were told, then you'd potentially wind up with parents trying to sue for their kids hearing damage( real or not). Too much of a liability issue with kids around.
As for people not calling blank fire hits, there's plenty that don't have the integrity to call actual hits. It doesn't tend to bother me like it used to, and I know it would be even worse with blanks. It is what it is,if you expect it,the "cool"factor outweighs the "hack" factor for me.