The problem is shrinking global liquidity. Losses in the Chinese financial system and in the global energy sector are forcing governments, central banks and sovereign wealth funds to sell assets around the world. These are some of the biggest asset managers in the world.
It is unclear to me how this will end. When the mortgage market melted down and destroyed the balance sheets of banks, the Federal Reserve liquified their illiquid assets using QE. For better or worse, QE restarted the jammed shut credit engine.
At the moment, outside of wholly energy dependent countries (Middle East, Latin America, Nigeria, etc.), there does not appear to me a 2008-like financial system shutdown.
Coming back to tech. IMHO, big tech companies with inflated multiples (as benchmarked against the FCF generating engines at GOOG and AAPL) now have a target on their backs. Unicorns that aren't cashflow positive are going to learn how to negotiate down rounds. Real estate values are sticky and will hold up longer than people think. Engineer salaries are not going to drop a whole lot. The number of people employed might.