It can heal up. Plenty of players have had broken fingers that heal during the season. The splint he has on should do a good job. I am guessing it will be off in a couple weeks unless he has rebroke or agitated it, which could happen. If it is being constantly agitating it then it wont heal properly and be a bigger issue but I doubt they would be letting that happen.
As much as we want Hill back I would make sure he is properly healed. A wrist is easy to resprain or agitate and sprains usually take at least 6 weeks to properly heal. I doubt they keep him out that long though. I think they will bring him back early and hope it doesnt get hurt again, that seems to happen more often with wrist and ankle sprains.
But to be honest I leave injury stuff to better people than me. I deal with healthy people mostly or at least with doctors during the recovery process.
He didnt sprain his wrist though. He sprained his thumb.