What happened to awesome concept cars?

When I was in high school from 2000-2004, concept cars were awesome. Chevrolet had the Bel Air, resembling Ford's ill-fated Thunderbird revival. They also had a modern version of the Corvette Nomad. There was the Plymouth Howler, the 1,000 horsepower Cadillac Sixteen (a modern version of the 185hp Cadillac V16), and various others. Nowadays they seem bland.