I'm seeing a lot of e-bikes on my north-south commute to Hyde Park Gym, including and especially, cargo style bikes, using the bike lanes on Guadalupe between 45th and almost to Hwy 183. My impression, based on the carrying capacity of these bikes, is that for many (most?) of these riders, it is their sole transportation.
Future? As regenerative braking and new battery technology comes to ebikes, their popularity in cities and elsewhere will expand as their range increases.