Is social mobility achievable?

The Daily Mail, has published a variety of articles contemplating the impact of Kate Middleton in the royal family. Does this mean that Social Mobility is achievable once again? Or was she already upper class? What do you think... see the links below!

Our leaders seem hell-bent on crushing social mobility. Thank God the Middletons of this world refuse to be kept down

http://www.dailymail.co.uk/debate/article-1331447/Kate-Middletons-socially-mobile-family-refuse-kept-down.html

Humble Kate has noble blood after all: New study reveals Duchess's links to earls, countesses and a former Prime Minister

http://www.dailymail.co.uk/news/article-2249023/Kate-Middleton-New-study-reveals-Duchesss-links-earls-countesses-Prime-Minister.html#ixzz2NsjXqhTY