Lithium glass batteries could be the breakthrough for short haul, and even long haul electric flight.
The designers could get very creative with wing design and release much more efficiency if they didn’t have to also use it as a fuel tank.
Which makes designing a new plane right now a headache.
Do you make it future proof, so a battery pack can be put in the hold, and a ducted fan could be placed where the jet engines are. Decisions decisions…
Don’t lose sleep over oil though. Oil reserves will deplete less rapidly as fossil fuel powered cars and trucks are banned (2040 seems to be a timeframe governments are aiming for) and electric cars take over. And green tech powers infrastructure. Solar and wind generation is plummeting in price.