I really cant explain what exactly is going on. While the Shelby knock-offs have been being built since the '70s, the new brands are showing up awfully fast. I think most of the time the cars are comming from millionaires who have nothing better to do and decide to build the ultimate sports cars... Or they are former racers that decide their name carries enough weight where they can build their own cars... Maybe they are sick of the corporate world and want to build their own cars their own way...
The new Fisker cars are a good example. Fisker had worked for many automakers over the past few years, and I belive had a hand in the styling department at Aston Martin for quite some time. His new coachwork models based off the 650ci and SL500 are great cars, but no one in their right minds are going to buy these $70K stock cars and have them completely torn down and rebuilt for another $70K...
Then again, look at companies like Saleen and Mosler. They have been rather successful, and although Saleen has been building cars for years, he has managed to deversify even into the truck market with modified F150s. Mosler has been selling the MT900 sucessfully both in street and track setups, and even the Photon was given major props for being to match the S7, Enzo, and Ford GT in most performance categories, even when down on HP.
Indie companies are going to continue to thrive, I dont think that there is any question in that. The thing that keeps them alive is the fact that people want to drive cars that are different, and with so many people with different ideas on how to build them, the trend shal continue.
Thats why my brother and I want to start a custom car shop, but not to the extent of anything spectacular. A few custom touches here and there, mostly under the hood and in the interior, but nothing too drastic.