I agree that hybrids are the way to go.
Just don’t see, in the commercial arena, a hybrid aircraft as being useful for anything more than short range commuter type operations.
Hybrid 777? I doubt it.
Hybrid 777...
Look up Boeing blended wing those will almost assuredly be powered by electric drive trains tha fan sizes needed to fly one exceed what a mechanical gearbox could spin with reasonable power to weight. Electric drivetrains exceed 20hp per lb. Hybrids vs direct gasturbo alternator driven electric bus is only a battery away both have turbines ,inverters and power busses drop the batteries and it’s just like a ship or locomotive where the engine spins the alternator which spins the high power density motors. Again mechanical drive trains and gear boxes have been left behind they max out in the 6:1 no where near 20:1 or more . High temp Superconductors will be common as well pushing the power to weight into the 30s or more. No need to hate electrics which boomers seem to be butthurt about. Virtually every ship with azipods is electric drive, tugboats same same. Newest Navy ships also electric drive. These are hundreds of megawatt drive trains where mechanical drive would be a maintenance nightmare let alone multiple times heavier. I would bet good money that the next gen of 100,000lb thrust fan engines have electric drivetrains driven by a bank of smaller lighter gas turboalternators the redundancy alone is worth it.