I'm going go list all of the fallacies in your post
1. The Sox stadium lease deal with the IFSA runs through 2029. Not sure what your definition of "soon" is, but mine isn't 11 years. Theoretically the Sox should be contending for a really good duration of that 11 year span, which will drive attendance (as you said) because they'll be winning divisions with the Indians having to start a rebuild, the Royals in baseball purgatory, the Tigers starting a rebuild, and the Twins being decent to not great.
2. You have no idea what the "right target audience" is. I am paid to cover the White Sox. I have developed a pretty large social media following, largely on my own, that targets the exact demographic of Sox fans that are buying into this entire rebuild - millennials who will be the ones supporting this team for the next 30 years or so. I have met with the White Sox marketing department and they have asked MY advice on how to reach out to this demographic more. They pay me to host events at the park. Rick Hahn, Frank Thomas, a half dozen of their top prospects, and next week Hawk Harrelson will come on the White Sox podcast I run because the organization knows that they have to do a better job of connecting to the coveted 25-35 year old fan. The stadium has significant advantages that draws the EXACT crowd it draws right now; either the most DIEHARD of Sox fans, or people that live in the Bridgeport/McKinley Park/ Armour Square/etc. neighborhoods. You literally cannot win this argument.
3. Armour square sucks. I don't particularly enjoy going there after working 10 hours a day, and neither do the vast majority of Sox fans. If the Sox and Cubs switched locations, who would sell out every game and whose attendance would struggle? Wrigleyville is the B1G post grad capital of the world; people from OSU, Wisconsin, IU, etc. all flock to wrigley on a nightly basis though they have no real Cubs fandom.
4. The early returns of the prospects you mentioned are incredibly encouraging; sure Giolito isn't playing to his "star ranking" for an easy analogy, but Eloy is killing the ball in AA, Zack Collins is getting on base at a .470 clip, Yoan has flashed MVP potential and is only 22, Abreu is as consistent as any hitter in baseball YoY, Lopez looks great, Cease, Hansen and Dunning are all dominating MiLB, Luis Robert is a legitimate 5 tool threat and will rocket through the system, and they have the 4th pick and a top 3-5 pick in 2019 coming up. Not every team hits on their "can't miss" prospects. See: Junior Lake, The had to lose 100 games to draft Kris Bryant; the Sox are fielding a bad team by design as well. In a year from now, there might be 10 players on this current roster on the team. They're bad because they're supposed to be. They'll also have a payroll sitting about $50MM, even after arbitration hearings next year. They're going to be able to drop a TON of money, even if it's just to get back to their 2005-2010 payroll numbers that they had in the mid 2000s
5. You have your doubts on them executing that strategy, but they just executed a strategy that won a WS 13 years ago and this one is designed to have staying power
6. I just got yelled at by my boss for not doing shit at work today, otherwise I'd continue