Given the projected IPOs next year (Lyft, Uber, AirBnB) I think this is a little pre-mature. I think the bull market has another year in it. That being said I'm shifting some of my assets out of the market.
I'm not, but its one of the things I track. A mixture of unemployment, yield curve us2y10y spread, deal activity are all things I look for to signal the end of a cycle. Tomorrow's job report will be interesting, but given all the other indicators I still think we're looking at a sideways to up market next year. Caveat being the risk of a recession elsewhere in the world and the contagion effect.