Got any statistics or anything at all to back that up, or are you just talking out of your butt?
I can't think of a team sport position that has fewer sudden starts and stops than a baseball outfielder.
Statistics? No. Common sense? Yes. Constant was the wrong word on my part, sorry, but you kind of proved my point with your second statement. An outfielder is standing around letting his muscles cool down for an extended amount of time. Then all of a sudden he has to make quick explosive, movements such as sprinting and throwing. Which puts you at greater risk for strains, pulls, tears, ect.. In football, basketball, soccer, ect. you're moving around more so your muscles stay loose and warm.
This is pretty insane, really. There is no more of a stop and start sport than football. It is a guarantee that you stop for around 30 seconds between plays, but then you are on the sidelines between offensive or defensive series, there are special teams players that see the field only 5 or 10 times a game, and many times, different packages are subbed in and out and formations are used. It really isn't that big of an issue in baseball; an outfielder might see one or two hits a game where they actually have to run. Baserunning, now that is stressful, running in a circle. Not. Baseball can be dangerous, no doubt about it. Stuff happens all the time. But when you add in the fact that football is start-and-stop AND full-speed, all-out contact on every play, that is where the difference is. If Bubba really wants to have the best future he can have, he should go straight to pro baseball, unfortunately. Baseball players have much longer careers than football players and are much healthier afterwards.
And VA Husker Fan's point was that yes, outfielders have starts and stops. But they are few and far between. They also involve running purely in a straight line as opposed to cutting, spinning, juking, and getting drilled by a 240-lb linebacker.