Not practical in many situations. Hot in the summer, and, with a full cover, condensation problems in the cold. Parking and storing is much different from a bike. Handling, like carrying up steps or putting in a car is difficult. Having a flat tire must be fun. As mentioned strong side winds can be a problem. For the price of a new Velomobile, or less ($3,000) I bought an old Corolla that gets 30 mpg around town. Over the years put maybe another two thousand or so, and it runs perfectly. Four passengers with a bike in the trunk, or using my four bike rack on the back. It's not worth anything the taxes and insurace are very low. I could store a couple more bikes here, but, not one Velomoble unless outside, which would ruin it eventually.
In 2003 I built My Litespeed for $6,000. It has thousands of miles on it. Last Saturday 110 miles on it. Worth every penny. Same for all my bikes.