This is a fairly common sentiment, often apposed by those without children, which misses the point.

Yes, parents want to be able to make sure their kids don't watch things they don't want them to see. They want to pay attention to what their kids are watching. The problem comes when there is no guaranty that any given show won't contain 'bad' things, thus they cannot make as intelligent a choice* unless they watch every single show all the way through before they show it to their children. And parents who care still don't have infinite time on their hands.

*Yes some shows can be ruled out immediately, but others could have things you wouldn't think they would.

Publishers don't get anywhere near that percentage of the sale price. This article about the economics of game development is a couple years old, but using it as reference, I would be surprised if publishers were getting more than $20 for every game sold. (And the developers are getting even less)

Not to detract from your point, because I believe it is valid, but keep in mind that remaking older technology using newer technology is not necessarily easier because our new technology is faster and 'better'. For instance, in this story about remaking the first video game, they mention that it took 4 people 3 months to put something together that originally took one man a little over two weeks, because of the way the technology used had changed over fifty years.