I'm a cyclist and I would find it hard to believe that the number of injuries/deaths go DOWN. Sorry, but yes, I am healthier, but I also am placing my life in much greater risk by riding than if I were driving to my destination. I would HOPE that wouldn't be the case, but I'm a realist.
Isn't that a projection based on if drivers switched to bikes for 50% of their journeys of 5 miles or shorter? It makes sense to assume that the much greater reduction in cars on the road would lead to fewer auto accident deaths.
Which is an unrealistic projection to make, especially when they are showing a map of the midwest, where I live! We can only ride (maybe) eight months a year, up here, and four of those suck, as well. 
I would absolutely love to live in a place where this was the norm, but I simply don't have that optimism for the USA to ever get there. Look at all the debates/discussions we have just in this forum on public transportation. We (as a society) have been raised since day one to love our cars and need our cars. Heck, I know I am in that group. But, I also love to ride my bike. I just wish I could do it more safely. Sadly, I find myself hauling my bike to a "safe" location, just so I can ride peacefully, then loading it back onto my car, and driving home. 
I used to be able to ride to and from work. The ride was only about 4 miles and was relatively safe - most of it was back roads and there was even a segregated cycle lane for a small portion of it. But then I moved and it wasn't really a very good option. I would occasionally take my bike to work and cycle home. I moved again and now it's just not feasible at all. I'm about 15 miles from work and the route is so scary. I have been trying to find a decent halfway point in order to get the chance to cycle part of the way - but it's just not happening yet.
You need to stop moving!

Yeah, 15 miles, even with good weather and little traffic, would take its toll on you.
In a more-perfect (perfecter?) world for me, Jax would be more like Atlanta, or Atlanta would be on the ocean. I would love to have the equivalent of the Silver Comet Trail in the Jax area, and now they are also building the Beltline, which will add huge amounts of recreational cycling paths to the urban core. Other than that fairly recent 15-mile long path they just opened up (Baldwin path?), there isn't much like that in the Jax area. There are so many cities we've visited that have made safe cycling a priority, even right into the downtown CBD, such as Ft. Wayne, Austin, and Columbus. Granted, two of those are major university towns, which adds a huge number of cyclists to the mix. However, it doesn't take all that much to do, but someone in the right place has to want to get it done.