I can foresee a few problems in such a project, Lance was a fairly unsympathetic character. He was certainly an inspiration to those afflicted by disease, but he seemed always to be driven by antipathy. On the one occasion I can remember him making a conciliatory gesture, 'gifting' the Ventoux stage to Pantani, it blew up in his face. So we would have his tough upbringing with his single mother, the early career, the big C and then the tale of Lance fighting the accusations of the French Press, six times. Meanwhile, splitting up with the missus, taking up with Sheryl Crow then splitting up with Sheryl Crow.
The scriptwriter would also need to explain racing tactics and introduce a range of characters with bewildering names. I'd go for a buddy movie vibe with George Hincapie as the Sundance Kid to Lance's Butch Cassidy, and then conflate all the incidents from his TdF career into a single race.
Damon.