I'm sure a win against Chelsea would see some who were doubtful about renewing go ahead and do so. The question you ask is impossible to answer with any accuracy, but we do have the precedent of the season after we got relegated (14/15) to go by and my recollection of is that it was funny to hear the attendances being announced because it often seemed that there was about half of the official attendance in the ground. Our average attendance was 20,945 in 14/15, so you can get a rough idea of how many season tickets ad been sold - on the basis of what happened before I would say about 50 to 60 per cent of current season ticket holders will renew. I think it's fairly obvious that there were those who took a gamble in renewing for 14/15 in the hope we would still be in the Premier League and put the fact that they ended up not going to any matches down to experience - at the sort of prices being charged this time around I'm sure there will be plenty who'll make that same gamble again.