Many film lovers fail to see the business side of this argument. Having worked in corporate America for the better part of 20 years, I can say with utmost confidence that movie remakes are all about cashing in on past movie successes. It's not about making a quality product. It's all about making as much money as possible at the box office in the opening weekend. Like most other industries these days, the major corporations have taken over and the days of independent film making are all but completely buried. It's not as if all filmmakers don't wish to make some financial gain on their work, but these days artistic creativity has been completely diluted by the desire to turn huge profits.
I can picture in my mind now the thousands of original film ideas that are pitched to the major film studios each year that never get a second glance (or even a first). The goal is to make as much money as possible for top stakeholders, not to make a film that audiences will want to return to see or even talk about for years to come. As long as they can reach or surpass their estimated return on investment that one opening weekend, then that is all they care about. One way to do this is to capitalize on the title of a once-successful film or film franchise. In the minds of the studio executives, this is a safer bet than taking a chance on an original film idea that may or may not yield the desired results. They know that most fans of the original will go see the film for nostalgic purposes. In order to captivate the younger audience, you throw in a couple of current A-list actors (regardless of their ability to act), throw in a ton of CGI effects and then rely on a portion of the older audience to tell them how great the original was and how they should go see this amazing "reboot" because it is bound to be just as good if not better than the original. The usual result is the remake will be a smash at the box office and all stakeholders and filmmakers will be richer and happier. They will reap any residual profits for the next few weeks until the movie leaves theaters.
After about 6 months to a year, the remake will be long forgotten by audiences (usually because remakes suck) and will eventually turn up in the bargain bin at Wal-Mart. Those of us who are die-hard fans of original film making will continue to remember and appreciate the original and all the hard work and imagination that went into making it and will do our best to forget the remake ever happened.
Watch Robocop (2014)! It was terrible! It was nothing but cheap CGI! Alright, lets say that every kid saw the new one. They might think that "Oh, Robocop is terrible" and they might think that all of the Robocop movies are terrible! The original one was worth seeing, while remakes are just excuses to get more money. But at least there are no remakes made by Paul WS Anderson (that fool that screwed up the Resident Evil Franchise). What filmmakers should really do is to remake crappy movies to good ones. Dawn of The Planet of The Apes is actually a remake of Conquest of The Planet Apes(which was really really terrible).
The remake is just trying to reach a new generation of moviegoers. The original is usually peoples favorite if they viewed it first, because of all of the nostalgia surrounding it. Remakes can blow the breath of life into franchises that were long dead, and it often results in another quality movie.
A remake isn't going to destroy or eliminate the original movie it is trying to remake from existence. The original movie is still there, and you can still watch it even if a remake has been released for it. You can at least convince some of your friends or their children to watch the original film just in case they saw the remake first.