Jon Stewart REALLY wants the Mets to be good -- and REALLY wants 'em to sign Bryce Harper -- but he's also been around long enough to know they'll bungle it.
"There's no way Bryce Harper is coming to the Mets," Stewart told us in NYC ... "It's not possible!"
Harper is reportedly looking for a MASSIVE new contract (some say $400 MIL) with his eye on several teams. But Stewart says fellow Mets fans shouldn't hold their breath.
"I'm sure they just signed a 14-year-old they're sure is going to be the next Bryce Harper," Stewart says .