I can see why your proposed edits were rejected. They were pretty drastic changes to the question, without significant improvements to the existing revision. The original:
At this point, the first season is not over so I do not know if this question can be answered already or not, but is the Game of Thrones television series planned out so each season roughly equals one book?
I am considering reading the first book after the TV show has finished depicting the events in the first book because I would rather not be spoiled when watching the TV show.
Your first suggested edit:
I was wondering, how does each season of Game of Thrones relate to each of the books? Is it one book per season? And do we know how it is planned to continue going forward?
(At this point I feel the series is going to overtake the books?)
Rejected twice for 'This edit changes too much in the original post; the original meaning or intent of the post would be lost.' Your second suggested edit:
Does the Game of Thrones TV show have each season roughly equal one book?
Was also rejected for the same reason.
Source: review 1 and review 2.
Essentially the issue here is that you're changing a great deal of the content of the question, without really improving it. The question does boil down to 'does each season map directly to one book?' But you're removing the important context that this question was asked before those later seasons existed. You're also removing the asker's reason for asking the question. In so doing, you're removing things that don't need to be removed, and you're not improving the quality of the question.
In addition to this, the question as asked, and the top-voted and accepted answer are not out of date. The answer says that the first 2 seasons will be, but the 3rd probably won't (and sure enough, did not) contain all of the 3rd book due to that book's length. This was posted in 2011, and is still current today. Your meta question here has a good question about questions/answer that end up changing over time, but this isn't a particularly good example of this.
For a good example of how we've handled it, I recommend looking at some of the Legend of Korra and Avatar: The Last Airbender questions about people bending multiple elements. Recent episodes provided new insight to these questions, and we got new answers and edits to existing answers to address the new information.