I think it depends on a lot of unknowable things. Mostly though, I suspect that if things go as lenny is predicting (and there are good reasons to think it might!), we may have a lot of people vandwelling more out of necessity than anything else. Even looking at current trends, I know that I bought a house because I was told that it was a good investment and a hedge against inflation in terms of housing costs. It has been those things for me. However, s&bs may be less of a good investment these days and sure aren't the same hedge against inflation that living in a van would be. There are also trends with younger people choosing experiences over material things and if that continues, I expect we will see more vandweller nomads.
Like others here, I don't think the true nomads will have too much trouble. They simply are not in one place long enough. What might change is the availability of free boondocking. There will always be campgrounds one can pay for. From what I understand this is more or less the situation in many places in the East of our country. Even in places like the town where I live, where sleeping in a vehicles is prohibited, the enforcement is lax. Anyone who moves on quickly will be ok. I recently got exited because some van dwellers parked in front of my house. I watched them get ready for bed and then they moved on, presumably to park someplace else. I suspect that they were not hassled. I wonder though how that might be different if there were hundreds of people doing this every night in my town? I imagine that folks would not like it and there would be a call to increase enforcement. So for nomads, I guess it depends on the trends. Usually though, things like this go in cycles. From a political point of view, what I would do to help would be to help young people and poor people find the housing they would prefer and just count on a lot of people finding S&Bs to be their preference.
The people who may have the most trouble are people who need to stay in one place for various reasons. I brought this up with my city council person since the ordinance is that there is no sleeping in vehicles and I want to sleep in mine in the backyard. His answer was to just do it but to remember that if anyone reports me I could be asked to stop. The point is to do it in a way that doesnt bother the neighbors and I am cool with that. Again, a lot depends on trends. What can be acceptable to a community when one or two people are doing it can quickly become unacceptable when many are. This is especially so when the people who are doing it are too poor to do it in a way that keeps them out of sight.
At any rate, it is the kind of thing which can be killed by popularity although as was also mentioned, if enough people are doing it, they can organize and work to make it more acceptable and mainstream