I cycle to work now on an ebike and it's awesome. Just need to dress warm when it's cold. One catch is there's an obvious range limitation. If it takes longer than other forms of transport, people are going to choose the other forms of transport. On the other hand, as congestion in a particular area increases, that equation shifts in favour of ebikes, meaning they can be considered organic efficiency regulators of the transport system.

Another catch is safety. Forcing bikes to share the road is dangerous. Cities really need bike lanes.