We aren't Manchester United, Man City or Liverpool who will always appeal to young fans due to their success and the fact it's completely acceptable in the school yard to follow them. In Sheffield kids will of course migrate to us if we're the highest profile team so I get what you are saying around PL survival but I don't see why upgrading the ground would be detrimental to that. It's highly likely that we will be flitting around the bottom half of the table at regular points for the next few seasons due to our relative budgets against our competitors, but what will capture the young fans is experiencing a matchday and the atmosphere from seeing it live and not on TV. That is what can't really be explained to those that have never really attended, there is something special about matchday, and particularly at the moment there is something special at our club. A bond between the fans, the club, and the management that is tangible. It's special and it's addictive, but you need to be part of it for it to get it's hooks into you, and that's what attending matches at the moment does. Allowing new fans to attend, injects new life into the club, new energy and builds something for 40-50 years, not 3 or 4 and should we go down at any point, some of those will stay.
One additional point ref the academy, I don't see how investing in the academy would help us stay in this league in the short/medium term. We haven't focused on our academy for a while, so any improvements aren't going to see returned for at the very least 5 years. I believe we need to improve the training grounds, absolutely, but an academy overhaul, maybe going for an A status, can wait until after the Kop has been expanded. Especially as we have a unique opportunity to do that work without impacting those currently attending. All the other proposed upgrades can wait, or be redesigned appropriately, but a 35,500 ground would seem a sensible mid-step given season tickets didn't make it to general sale last year.