there are only a very limited number of spots in the spotlight of the media
Um... duh?
You can't drive a whole industry like that, those games are the exception.
There's a lot more to it than that. First, as you pointed out, there's a very limited number of spots in the spotlight. Just like in any industry, there's only room for so many players, because there's only so much demand. Not every game is going to be a huge hit like that, not because they didn't follow your steps 1-3 in your previous post but because there's just not enough demand. The point is that any game from any studio has the potential to reach those heights if it meets the demand better than other offerings.
But it's always been that way. Those games really aren't so much "the exception". Those unusual ways are how most big game studios and most good franchises got their start. Call of Duty, for example, was started by a handful of guys who left EA. They weren't well known when they released the first CoD, but it was a huge hit, just like Minecraft, just like Angry Birds, and just like many many others. Not because they had years and years of past popularity but because they made a fun game.
What's new here is that now it's possible to leverage that viral popularity to make the next release that much better.