I commute on a Class 2 e-bike, and if it wasn't for that I probably wouldn't be bike commuting. Sure I'd still ride one of my conventional bikes during the weekend, but it's really nice going to and from work every day on a bike and not having to worry much about crazy headwinds and hills. My fitness has actually improved, but that's because I choose to ride using the lowest level assist. So long as folks are getting out of cars and on to bikes then it's a win.