You do realize... if Facebook stops making changes (updating) it will fall behind the other social media sites. Especially Google+. All Google has to do is look at the complaints about Facebook and make sure theirs does not have the same faults.
You know Google is trying to unseat Facebook at the premier social web site. If Facebook keeps changing, then Google is going to have a harder time being "better".
When you really think about it. It's really all just about the money anyway. Advertisements and how many people might see those advertisements.