At the risk of upsetting those that demand a Blue Wall and nothing less I think that the club proposal of 3000 rail seats at the back of the NS is a decent one. For starters, it won't affect those who are already in NS2 who don't want to stand and those that get the standing area seats will know what they are signing up for. If 8000 additional seats with 3000 of them standing can't generate more noise then there isn't much more the club can do.
The 'red line' of 1894 for rail seating in the entire stand except for the GA+ plus bit is a maximum demand that was never going to happen so they were always going to be disappointed.