I think the ABs were deliberately taking up time at the end.
Someone else suggested this in a different thread: I'd like to see an EVL where when there is a reset scrum, for any reason, the clock stops until the ball emerges successfuly from the new scrum.
So that you can't waste time by disrupting scrums.
You are neglecting the fact that taking the scrum was a choice made by the attacking team. They saw the scrum as their best chance despite the time situation.
Your proposal would also mean that the same would have to be done for every scrum from a penalty and every lineout.
Making decisions in the heat of the battle is part of the game and part of good captaincy. Removing this aspect degrades the fabric of the game by removing the need for tactical decisions from both sides.
If the defending team evaluate the situation and decide that infringement and even cards are a better tactic and time eater then that's no different to sports like basketball (except the decisions need to be made by tired battered players rather than sideline coaches).
On the flip side it is up to the attacking team to make the best decision to help their chances under the situation. In this instance I was amazed that Robshaw was opting for a scrum, knowing how much time it would eat off the clock. I'm certain that in the same situation the ABs would have instinctively taken a tap and backed themselves to score that way.
As for the Cruden try, while it may seem the best option for veiwers that the TMO is used, remember that TV camera angles will often make it difficult to see. It is quite possible that NO had seen a legit try yet if he had referred it for clarification it would have come back as inconclusive.
Here is the try confirmation (potential "double movement" notwithstanding)
