weekly sentiment as reported by Barrons is about as extremely bullish as at any time in the past. IN the past (and of course history never repeats itself) this has led to bear markets, or at the very least, a correction within 3 months which drops the markets below where they were when the extreme readings happen.
So buying now, unless you are a short term trader makes no sense. Obviously, price action says higher highs ahead, and I am sure we get at least one more rally to new highs after the next 5 to7% correction, but long term investors should be selling, not buying now.