I don't really see the point in removing the ability to pedal. What, just to remove yet another age old tried and true basic technology from our lives? Pedals offer an alternative natural power source when your battery gets low, and some people still occasionally enjoy exercise.
32KPH ≈ 20MPH
That does sound fairly reasonable for a bicycle speed limit. Most typical mechanical bicycles tend to have an average comfortable cruising speed of around 11 to 12MPH. Max speed really depends on the gearing of the bike and how much energy the rider can put into it, but it's not unreasonable nor difficult to refrain from going over 20MPH.
If I do ever get an electric bicycle, I want mine with the option to pedal as well.