If you take a look at the Lyk website there is quite a good item on the legal position and the expectation that 100LL will be dead in the US by 2020, this was pre this legal development. In the US there is a big debate on a one two or three fuel solution. In the UK we currently have a three fuel situation already, Mogas, Avgas 91UL and Avgas 100LL.
Rod1