I think the toxicity of batteries is trash & electric would never work for the range I ride but...
Think rc cars brushless motors & the like , electric torque & all power now. If you were just running motos , direct drive , get down to mountain bike + battery & electric motor type weight & the possibilities could be there if the weight was lower & you said f-the range. Not that I'm a fan by any means but if you like rc cars & you've seen the progress in the traxxas rustler for example...