The big problem with all of these though is they are all unpleasant in inclement weather and cold temperatures.
The big problem with all of these though is they are all unpleasant in inclement weather and cold temperatures.
The other problem with conventional bicycles is that it's hard to go very far without getting sweaty -- depending on the weather, of course, and one's patience for riding slowly. It's nice to have power assist.
Folding bicycles can be compact enough to carry on any mass transit conveyance. The Metroboard is certainly quite compact and portable. Not sure about the Trikke.
You're right that weather can be a problem.
I ride a bike here in northern England. For two short rides of about 15-20 minutes each way, the chances of being rained on are pretty small; maybe ten times in a year? If you had a folding bike, then ten taxi rides on wet days might be a worthwhile yearly penalty.