Will Formula 1 or Formula E be on top in 15 years?

In 15 years from now there will be only one premier single-seater racing series. But which one will it be: Formula 1 or Formula E?This question was put to me in Barcelona by a sponsor who has been in Formula 1 for a number of years and likes to think about the way things are heading. Sponsors are certainly heading to FE; some are leaving F1 behind, such as insurance giant Allianz ... Keep reading