You may be right and Lithium itself (or alone) may not be the ultimate long-term answer, it might be Lithium or it could be hydrogen or flux capacitors (Back to the Future reference for you older ones out there!) or something we haven't even been made aware of yet, but I disagree that rules out electric.
In almost every form of transport, which by definition includes motorsport, there is a tremendous amount of development and research going into electric propulsion and it's almost a given that either your children, and/or your children's children will grow up with electric vehicles.
Therefore, as we are building for the future generations of Mugen we have elected to test our development and show our progress in the form of TT Zero.