Always entertaining to imagine the Queen City's possible futures, being blessed as it is with economic advantages the envy of its peer group, and which lend themselves to fanciful thoughts. I have no doubt a few more Ferraris and Rolls Royces are in its future, but these are not necessarily the cars of choice for billionaires and unfortunately Charlotte shares this same attribute, in that it is not necessarily the city of choice for those of that wealth class either. Not a knock on Charlotte, because as a few have already replied, being on such a list is not a pressing "check the box" item that will make, or break its future. I'm sure within the region there is at least one, or two who already call Charlotte/western NC home. Hard working and scrappy is the character of Charlotte's class of "wealth" generators. The backbone of the City. If it can continue to successfully grow and support this class Charlotte will do very well.
The players that revolve around, and feed off, the billionaire class have a very particular ecosystem that enables them to survive and prosper. The City is not a fabulous resort, or port of entry, nor a wealth creating center with little to none of the support/management systems tailored to these activities, nor is it an "entertainment/media" center, regional/global center of politics, or natural resource controller. Charlotte will continue to land the occasional middle American type headquarters (Honeywell), and hopefully continue to innovate within the business categories that have set up shop, (such as fin-tech), and support and nurture the homegrown ones (energy and energy spinoffs vis-a-vi Duke Energy). These are solid industries, with support needs in the upper levels of white collar legal and accounting worlds........ more than enough capacity to churn out a few millionaires with their Ferraris and occasional Rolls Royces.
What they do not churn out are billionaires and, for arguments sake, even if they did those within the companies that reach the requisite number of zeroes, would find themselves moving away, or spending most of their time away, to the places that participate in the ecosystem that supports their needs. A very complex system for a very finite and mobile group of people. Within stone's throw Atlanta, Houston, Miami, Dallas, and DC, all three to four times the size of the entire consolidated Charlotte Metro, average at the bottom of the global ranking if you look at them from a weighted tier perspective. We could get one or two more who move to the area (western NC), but Charlotte is not in the ecosystem that would support many more, and barring world upheaval the City will be hard pressed to find the means to join such a system.