Kathriona Devereux has become the owner of a cargo bike - describing it as one of the most exciting purchases of her life!www.echolive.ie
The state of it
This is the future for short distance commutes.
I'd be dubious about carrying children on an ebike myself because of the amount of maniac drivers on the road but I can still see how ebikes could replace the need for a 2nd car.
As for the rain issue, your smartphone will give you a pretty accurate short term rain forecast as would a cursory glance at the sky.
I cycle to work regularly and rarely get caught out by heavy rain.