It seems the B787, once it gets it's battery problem resolved would be the perfect airplane with their massive electrical power to use electric motors to taxi and push back. The APU would get them to a point when engine start could give them a few minutes to warm up and save tons of fuel. Also hydraulic power could be used if more efficient.
Now we have cars that can park themselves so why not have airliners that can push and taxi by automation with someone, ramper or pilot to monitor?
I hate automation that is required, deteriorating pilot skills, but using it to save labor costs and fuel is in the near future.