I did not find the arguments laid out for velomobiles all that compelling. All but 2 advantages of a velomobile can be had with a US $1000 electric bike, such as:
* pedal assist for acceleration and hill climbing
* not arriving sweaty
* very low fuel/electricity cost
The velomobile could potentially give me:
* rain protection
* faster speeds
But it would also lose me:
* portability (can carry up stairs, take in commuter rail train, etc.)
* storage space (barely bigger than a regular bike so home: garage, work: office).
* multiuse paths
Even at the SAME cost these disadvantages would outweigh the advantages for my use case - it currently only takes me about 3 minutes extra to get to work and about 6 minutes extra to get home over a car. The roads to work are all 25 MPH with lots of stop signs and traffic lights so being able to slide by cards on the right is an advantage of a regular-sized bike. And it doesn't rain that much where I live - I commute via bus 5-10 times/year due to rain. I really don't like taking a bus so that would be a time I'd love to have a velomobile - but not at a cost of thousands of dollars so I can skip taking a round trip bus ride 5-10 days a year!
On the other hand, I can certainly imagine a use case for a velomobile: If you live in a flat area with lots of rain and snow and a commute that uses roads that go faster than 25 MPH - perhaps the Midwest of the U.S.
edit: formatting