He doesn't have Vick's arm, and although he's faster than a normal QB he doesn't have Vick speed. Plus his running style is power, while Vick was elusive. He's not going to run NFL linebackers over like he did in college. Could be a good quarterback one day but he's going to have to get it done with his arm and save the running for short-yardage plays and when the d isn't expecting it.
I would be pretty suprised if Tebow makes it through a full game vs the Raiders if he decides to run the ball at all. This game is gonna be fun to watch.
If you think about it a high-quality RB will get hit 30 times in one game and not get taken out. Tebow is as tough as an RB, he's not getting KO'ed so easily. Now if he plays a whole NFL season the way he used to play at Florida sooner or later he will suffer a big injury just like most RBs do, but that's talking long-term. He can get away with it for one game.
I doubt it will be at all effective until/unless he establishes himself as a passer though. If the defense is set to stop his runs then he's going to average a yard and be back on the bench in no time.