It is going to take companies with the balls to do such things for us to get past our dependency on oil. Yeah they have a slim chance of it happening...but remember someone once thought a steam engine would be more successful than a combustion engine...
The Mercedes diesels built thirty years ago can be easily modified to run well on the grease that restaurants throw away. So, Mercedes knows how to build cars that don't need gasoline. But, even in the USA, there is not an infinite amount of restaurant grease available (except Flint, Michigan...world headquarters for greasy food).
Considering that biofuels is listed - outside of the US a lot of their vehicles are already diesel.
All they'd really have to do as a minimum is eliminate the gas engines from their lineup. We're the only dopes that'd have a problem with that.
If you look at the unbiased literature on every alternative fuel source, nothing is expected to be available in the amount or efficiency level which we Westerners expect for decades. That is why we have to keep pushing the idea of cycling.
My God why can't everyone be as smart as we are????