Researchers are not fond of speculation. McHugh is no different. There are lots of variables at work. For example, you must consider the fact that retirement ages are rising. And that many people choose to 'retire' or change lifestyles many times over the course of their lifetimes.
Money makes it possible.
The boomers are mobile. Barring a major change, like a renewed energy crunch, I think the idea of circulation, of moving about often, will be important to them. As a result, forms of circulation likely will increase as an alternative to permanent migration. I think that as the boomers reach preretirement and retirement age, all sorts of circulation patterns will become more common, especially for the middle and upper income groups most able to afford it. A different mindset has emerged.