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Let's not take phrases out of context and try to interpret them in our own way.
The point was that the transition from 2 to 3, which didn't significantly change the core gameplay, was well-received by fans. The transition from 3 to 5 didn't appeal to many, so a similar transition from 5 to 6 is unlikely to be well-received. Therefore, a breakthrough is needed, an interesting breakthrough, but no more than, say, the transition from 3 to 4. Otherwise, you can come up with anything, up to and including grenade launchers and tanks; the title can handle anything. Or you can present the game so poorly that only the name remains.
Just read the previous post. It's said perfectly; you might as well delete your own post.