I don't know. The manufacturers are going to build what is demanded, more or less. There seems to be quite a big selection of e-road bikes. I can only justify one bike, a MTB, but I'm planning on getting an extra wheelset with smooth rubber for the pavement.I wish the manufacturers were putting their energy towards the use of e bikes as green transport as this article suggests rather than the focus on e mtb's.
I've often wondered what would happen if a major city DOT gave $20 million in significant bicycle rebates instead of the same to "add more capacity" to a freeway. They could even make it contingent on using a smartphone app to track that eligible candidates are using their bikes for commuting.