That is ridiculous.  Capacitors are awesome.  They fully charge in a few seconds compared to hours for batteries.  BUT, they discharge just as fast.  That makes them extremely dangerous if you happen to be on the receiving end of a full discharge.  Most capacitors currently are sensitive to impact as well, so if they figure out a capacitor design that can handle the vibration of being in a vehicle or being dropped then they are improving capacitors but not making the case against batteries.