The number of people who simply moved their butts and their assets overseas is much higher. You can tell this is the case because the administration has been saber rattling for the last four years, and starting to work their way into currency controls.
Did you know, in order to renounce, you have to get the permission of the government? They charge an exit tax too for your funds. This is a currency control and it is one of the things that marked the soviet union as a bad regime. If you can't move your money in and out of a country, then you're not likely to invest in that country.
I'm not very rich, and I will renounce as soon as my second citizenship gets in. It will be easier for me because, not being very rich yet, I will be more likely to get permission of the government to give up my citizenship.