This isn't 2015, though. The current AAA grouping does not appear to have a position player on the same caliber as, say, Kris Bryant or Javier Baez, and the current mix of pitchers in the upper minors involves a promising flamethrower coming off major surgery (Wiggins) and a lot of guys with unclear ceilings.
Put another way, we're likely not looking at a wave of future All Stars coming up to kick ass and take names over the next two years. The Cubs have a good group of guys on the farm, and it's possible one or more of them breaks out, but recent experience PCA and Shaw have taught us that we will need to exercise a ton of patience with their hitters while they figure things out. They are also looking at a roster crunch going into next season because some of those prospects will need to be on the major league roster.
If anything, now is the time to push some of those chips to the center of the table.