It hasn't reached that level of nonsense again. In 2006, the median price of a house was 5.1 times the median income. Today it's 4.4 times median income, which is high compared to most of recent history, but is actually lower than it was in 1955.
Nobody thinks SPY is going to keep increasing forever. The conventional wisdom is we're looking at a recession in the next 1-2 years.