JB is too smart, they won't allow limited or hyped releases to sit, because those releases keep the masses lusting over shoes they can't get, and keep this whole thing going. A large part of the reason that limited releases sell is because they ARE limited. Shoes like the Bel Air 5s, and even the OVO 10s, wouldn't sell out if they were ultra GR's. All JB has to do is dial back the production numbers, and make things even more limited, if for whatever reason limited and hyped releases do start sitting, and they're back to sell outs.
If you think about it, JB really are geniuses. All these trash releases that don't sell out, like all these 5 Lows they're releasing, sit on shelves, and aren't bought by your average sneakerhead. Instead, they're bought by people who aren't seriously into sneakers, and just see them sitting on the wall of their local Footlocker type store, and recognize the jumpman logo. This brings them more new customers that don't know much about retros, these customers do some research into retros, and now JB has hooked a bunch more kids. The limited and hyped sellout releases keep this whole thing going, the only way limited and hyped stuff starts to sit is if the entire shoe bubble pops.