There are thousands of millionaires in the world. At some point they will dip there toe in bitcoin and open a small position. Even if they bought just 10 coins the price will explode. It's probably already started really...
I'm not sure about this.
Yes, there are a lot reach people in the world, with a thousands of millions but they invest mostly in the real marketplace, stocks, real estate, forex etc.
I don't think they will consider to invest in bitcoin now when they can cash out bitcoin only through some exchangers or bitcoin ATM.
In my viewpoint, turning point for bitcoin will be when some country in great financial difficulties, as Greece now, that has nothing to lose and is facing bankruptcy, decide to try to introduce a bitcoin as the main currency.
everyone is waiting for the next one to make the first move, if even only one of those rich guy that normally is playing with stocks/forex, shift to bitcoin, and start a good wave, i'm sure many other rich people will follow
when they will strat play between themlseves the marketcap of bitcoin will look like nothing you have ever dreamed about, eve 10k would look like a tiny drop in the pacific
p.s. i don't see the problem in cashing out, for them, through exchange only, it work the same as cashing their money when playing with forex market