Kind of BS. You can't look back to forecast that far forward. Also for the numbers to be remotely feasible, you need interest rates to stay very low for the next 30 years which is highly unlikely.
The ponzi scheme was financed by people buying a 100K condo, selling for 250, buying a townhouse for 400, selling for 600, buying an 800K house, selling for 1.5 etc. We have essentially lost the bottom step or two. Sure, some peoples parents are sitting on a giant amount of money tied up in real estate that they could leverage to help their kid(s) jump in at step two or three, but they are the exception. Especially if multiple kids are involved, not many parents can afford to distribute many hundreds of thousands times multiple kids to get them into the market.
Can you imagine if interest rates climbed even a little? People currently surviving while paying $2000+ month in interest are all of a sudden drowning paying $4000+ a month in interest. They need to get out and downsize to something affordable which will stall (and maybe even drop) a substantial portion of the housing market.