The Dow Jones Industrial Average punched through its record high on Tuesday, but for the rally to continue, some pros say the euphoria on Wall Street may need to spread to Main Street.
"It's not on record volume that we're reaching these record highs and it's not because of the chatter we're hearing outside on the street," Joseph Greco of Meridian Equity Partners told CNBC. "I'm a little concerned that in reality the market can't sustain it up here. The people that are going to be in are already in."
If these record highs are to turn into a sustained bull run, retail investors will need to jump back in more forcefully after sitting out the recent advance, Art Cashin of UBS told CNBC.