Mark Cuban is warning the NFL about a potential work stoppage. "If the NFL is looking at a stoppage when they just had the biggest audience in the history of television, that tells you that just maybe the cap approach to their economics might not work," said Cuban. "I wrote a blog post a few years back saying that NHL players lost more than one billion in wages for their missed season. "It could be more than that if the NFL walks out. The players can't ever get that money back. Their playing time is perishable. That's an awful big hit for players to take and very difficult to justify in any quantitative analysis."