It seems Manchester United will beat NewCastle tonight because it need more points to get more secure position there so that it can't afford to lose any game surely it will play more positive game and will win this match.
Van gaal's position will not be safe if manchester united have a draw or lose today. There are already alot of rumours going around on who is going to be the new coach of manchester united so van gaal might want to use this opportunity to recover the board management's trust on him
I think that whatever happens tonight, Van Gaal will stay, but next round United goes to Liverpool, and if there loose with such a boring performance, LVG have big chance to be sacked