well if you have those many rich people competing with one another, that 2% adoption rate looks mighty conservative, especially when BTC is booming into a difference universe.
What % of those rich people do you think actually own gold? (for the record I have no idea). If we knew that, we might get a better idea for what an appropriate adoption % might be for bitcoin.
EDIT: this link estimates 1-2% of americans own gold.
http://www.youtube.com/watch?v=Qoj-s-Hhfgs