Probably very worth it for several reasons. As you mentioned, Bradshaw is injured, and though he is scheduled to play, I did catch this on a Giants blog (I'm a Giants fan, can you tell):
After visiting Charlotte-based foot specialist Dr. Robert Andrews, Giants running back Ahmad Bradshaw will continue to play despite having a cracked bone on the outside of his right foot. But he remains one bad step away from suffering a potentially season-ending injury, which could happen if the crack breaks all the way through the bone.
“It’s a cracked bone in my foot, on the outside of my foot, which is probably the easiest bone to break. There’s a chance of it breaking all the way through the bone. If it does, I’ll have to get surgery then,” Bradshaw said Thursday afternoon at the Giants’ practice facility at the Meadowlands. “If it breaks, it does, and I’ll get surgery. If not, I’ll wait to the end of the season and hopefully then I won’t need it. But more than likely I’ll plan on having surgery.”
So there's a good chance he won't finish the season. And while MB3 is great, with Jones and Choice, the carries can get spread around in that annoying way that all fantasy owners loathe.
Third reason is that if you have Brown and Turner, you essentially have two studs, that are at least a decent play every week.
GET IT DONE.