God that would be disgusting. It would be Danny and Jerry trying to outspend each other. Only these two guys, who make more money than Colombian drug lords from their teams, would be out spending crazy money trying to buy a title. Meanwhile 10,000 fans would show up in the shiny new stadium Maricopa County bought for Bill Bidwell so he could pocket millions fielding yet another worthless Cards team. No salary cap wouldn't make big spenders sure winners, but it would make the skinflints the biggest losers you ever saw.
Unlike other sports where having just a couple of stars can make a team competitive, if you don't field at least 30 good players on an NFL team you are toast. Imagine a cheap team refusing to pay anything for decent offensive linemen. We could see the first team to give up 150 sacks in a season. A team that spent nothing on corners could average a full season giving up 40 points a game. Of course these teams would pretend to be trying by signing a couple of big name players, but if they skimp on linemen and corners they will get killed. Unfortunately linemen and corners don't put butts in seats in markets where fans aren't selling off first borns to get season tickets.
I pray we don't see a cap-less NFL in these days of milk and honey at the revenue trough, it would be ridiculously ugly for many teams.