I think part of the appeal of the M3W is its connection to motorcycles, especially naked bikes.
Possibly, but probably only for those who have never ridden a bike - like other trikes, they have all the bad bits of motorcycles -no weather protection, limited luggage capacity, plus all the bad bits of cars - getting stuck in traffic/unable to filter, average performance etc
I'd love to have an old 3 wheeler, but the reality is that if the circumstances were right to use her, I'd probably take a bike.