As new lighter materials become available at affordable prices racing bikes will continue to drop in weight maybe 5kg or less is achievable. As fossil fuels become more expensive and damage to the environment is more evident more efficient single person vehicles will become the norm including e-bikes although I feel single person micro cars will become more popular to protect those from the elements while travelling. So pedal assist micro cars could be a possibility. I guess e-bikes with fairings could become more common resembling lightweight motorcycles with the fairings including solar panels. Same for for fully enclosed rider vehicles with a lot of the bodywork having such panels.

I think as more people switch to e-bikes but want comfort and protection from the elements the pedal assist will become less important and reduced as the bikes increase in weight to offer such protection. Fully enclosed e-bikes resembling fully enclosed motorcycles of today could be common.