It's not great. Everything interesting has moved to the East Bay or out of state. All that left is high rents. I've already got plans to leave in April. The only thing good that remains is a lot of the most interesting tech jobs at the larger companies like Facebook, Google, Uber, AirBnB, etc. However even those have a shelf-life because it's only a matter of time (5-10 years is my guess) because those are no longer the exciting companies anymore. If SF starts losing the future unicorns to other markets, it's only a matter of time until the golden goose dies.
Word on the street is that several unicorns are planning more and more engineering growth outside the SF Bay Area in 2019 and beyond.