You don't know thousands though do you, plenty being a handful. Why aren't they members attending games? Hopefully they don't get the chance to take up a season ticket a way from someone who does.
Surely this debate would end if we just said all seats that are not corp. or hosp. go to season ticket holders either existing or on the list, any left go to GA. So work down the list, so main stand 4000 new season tickets... they might get down 8,000 on the list. no 1 do you want a ticket pay now or be off the list, no.2, no 3 and so on until all 4000 gone.
So while you could argue that this would be unfair to GA people the argument is, and if the hypotheses is right that at least 50% or more (im making up numbers now but that is the argument) of people on the season tickets list go anyway to the game then there can be no argument that such an arrangement would be unfair to the GA (as they are already all going ). The season ticket list would then be a more true (but not complete) reflection of demand but not for people who want to attend the odd game (but they could get tickets presumably through the club season ticket resale scheme - and according what si being said here, there will be plenty of those as most season tickets holders seemingly dont go).
As an aside Liverpool has the 3rd lowest season ticket allocation of premier league clubs (55%), Man Utd have 73%. Norwich had the most had 81% and they also had the highest stadium utilisation rate. You would think having the knowledge that more of your tickets are sold for the whole season would be of financial/commercial benefit?