I have witnessed teams in various sports excel with average talent. Usually, those teams come from winning traditions.
Sometimes, they push beyond expectations. And while they do not take home the trophies, they will occasionally get within arms' length of grabbing them.
Super Bowl culture is what has eroded within this franchise. Some teams have not been totally bereft of talent during the past three decades. All of those teams have not owned the will to win though. They possessed on-and-off grit, which will not get any team across the finish line.
Both talent and culture are key components. Each are dependent upon the other. Separate you get, well, you get no conference and/or Super Bowl appearances in 30 years.
Going forward, any Dallas team must build its own championship contending culture despite the inclusion of the franchise owner and family. Nothing is impossible, but the long-standing and established challenge cannot be ignored either.