The fundamental problem is always weight, which is why making a vehicle that encloses the rider like a car can only be efficient if it's sufficiently large to amortize the costs. I think the solution is flying motorcycles, which already exist in the form of paramotors and gyrocopters. Then the problem is that you're so light that stability and safety in wind is a problem. Despite their availability, i havent heard of anyone commuting to work via paramotor.