I had massive hopes for Biofuel about 10 years ago or so because literally the potential is for complete replacement of normal oil reserves. It is not science fiction that oil can be produced organically and using up carbon for modern cars to use in combustion engines. Thats a possibility its been done in the laboratory and its possible however its not been engineered into a feasible business mass production scenario not for this last decade and that is greatly disappointing. Im aware of rape seed oil and all kinds but the very best crop is not working out so far, it might at some time.
Many amazing things are possible but not quite feasible for every day consumers. Hydrogen fuel cars are being explored but there is great doubts on its ability to deliver across an entire nation, its not a given just because yes the car works theres infrastructure questions. Same for electric, however across the range of options I think electric is the one we are most advanced with.
Electric cars after all started in the Victorian age almost before the common oil or fuel car we use now electric was useful then and its improved till now though its been a slow journey we obviously have a great use, knowledge and ongoing need for electric as a fuel so why not the cars too. Makes sense especially if and when they improve its various drawbacks.
Number one word to decide all factors is efficiency, it has to compete with every fuel in some way and be reasonable as a choice. I think mass production will deliver dividends on results possible, stay optimistic