Prior to the downturn, there were FOUNDATIONAL issues which were evident (but ignored by folks making a lot of money) and which were causative.
Right now, there are just normal ebbs and flows of the real estate market. The downturn was predictable, somewhat obvious but ignored by people making a lot of money.
IMHO, the real risk to the real estate market are issues outside of real estate, such as our just-in-time food delivery system, energy, geopolitical issues and above mentioned issues. If you want to be afraid or worry (which I do not recommend) worry about those things.
Real estate has always had ebbs and flows. Rental markets always go up and down and do not remain static, nor do they only head in one direction. But the tremendous downturn had a cause. Look for foundational issues, not local trends if you want to ensure long term safety. If you are playing Russian Roulette with a hot market, perhaps you need to rethink that policy and/or develop a safety net.