Honestly its more Dwayne carrying the movie more than anything. Black people wasn't going to see it, older white peop le weren't (the ones who actually know and care what baywatch is), women in general wasnt, etc.
It was a a movie centered around prepubescent boys and girls with that kinda raunchy humor. And aside from The Rock I could care less about any other main costar
Might become a cult classic like Grandmas Boy (which was a flop in theaters) but only if it's funny enough but thats about it.
It will do well overseas probably tho