I think sometimes the only thing taken in these remakes is the name and the basic outline. That it is a remake does not necessarily mean it is an unoriginal film.
Although often they are, granted. But I can think of numerous fantastic remakes, and also numerous great original concepts from the last 10 years.
Also worth bearing in mind that cinema has relied VERY heavily on literature through the years, and many films people think of being "original cinema" took their basic concept, or complete story from works that already existed. Film is a visual medium, and often the story is only half, well, the story.
I'll echo this.
Dac, make sure you pay attention to what Hollywood has done in the past (the typical movies, not just the most famous ones) before you judge Hollywood today