Well Saudi King just called up the National Guard today to join the ground troops.
http://www.cbsnews.com/news/saudi-arabia-king-salman-national-guard-yemen-iran-houthi-rebels/
Interesting development. If, as expected, they don’t fight well or are routed, it is not an exaggeration to say that the Saudi royals could be deposed. The veneer of stability is thin and only possible because of enormous oil wealth. The Saudi royals (who financed, motivated and are responsible for 9/11) are decadent and will be swept away by the storms of the “Arab Spring”. Islamic culture is simply not compatible with the institutions, values and practices of modernity. It is this forced confrontation with modernity that is causing the stresses, chaos and painful transformations (much of which is reactionary and self defeating) that is sweeping through the Muslim world.