i think there is secular political opposition within saudi arabia. this blog is pretty good...
Fantastic | Crossroads Arabia
in helping to get a sense of it in terms of what it is where it operates and what kind of demands/problems are potential problems. the entry that the link takes you to argues that saudi arabia isn't that different from other countries in the region, particularly in the linkages between oligarchy and choked-off opportunities for younger people in particular--it's just wealthier. and, as is clear if you read it, the writer doesn't think abdullah can simply bribe these problems away.
so i suspect this information gap that shapes the concerns about saudi arabia....
note too that there are protests to come in saudi and kuwait.
bahrain continues to develop.
oman has had turmoil.
there's a lot of trouble brewing in iraq for lots of obvious reasons.
jordan's attempts to head off protests are tenuous.
libya appears headed into civil war....