Wealth and cash flow are two very different things. I can't tell you what the future holds for sure, but a few things.
If they have significant equity in their home, chances are good that they have significant equity in other places as well. I don't have data to back this up, with the exception of my role on the board of a my employer's 457b plan.
Timing, more than anything, has more to say on any matter in retirement that we give credit. One doesn't know when cancer hits. One doesn't know when COPD hits, and you have to move to Arizona. One doesn't get to pick when the market bottoms or tops.
Housing is a lousy investment from a purely numbers point of view. I became an owner very reluctantly and it has cost me dearly. Taxes have gone up 15% every year. While they house ages it breaks and I am on the hook for everything. $75 in weed/bug stuff today... next week it will be something else, and the week after. I've spent multi-thousands on this thing outside of mortgage that I will never recoup... also time and it pisses me off.
My sweat equity will never be recaptured, really. I am only 36 once, and I spent a good three months last year remodeling a bathroom (due to mold) and missed a ton of good run days, time with family. BUT I saved a bunch of money doing it myself!!!! Don't care, laying tile sucks ass. never again.
I can't wait until home ownership becomes a relic of the past.