Yep, this would have greatly reduced the running time of the film, but we all must admit it would be quite effective XD
Really, you make him cry and it's like you kicked a basket of newborn puppies, and then a basket of kittens, and then tore up your firstborn's fridge art that you promised was the best thing since the Mona Lisa. The world can't handle the level of crying that man can emit, it will bring Midgard to it's knees!
...Or Thor to his knees, actually. It took him two films AND several of the Nine Realms to be significantly Michael Bay'd for him to realize that when Loki gets upset, bad things tend to happen. Huge, crazy, world-domination-esque things that look like they came out of a Shakespeare in space production.