I dont agree with that.
They are two very different things.
they're not that different. in fact, the recent overlapping of the two in recent years has been well documented. it's not that odd that people like Severn, Shamrock, and now Lesnar have been successful at both. they are, in fact, more alike than different.
Wrestling has always been considered more kid/family friendly (with the exception of ECW and CZW, and look how big they made it),
that has nothing to do with the statement, and it's wrong. only in the Hogan ruled 80's and the current PG period has wrestling been considered a kid thing. even in the 80's you had other companies with a more mature product (thought not at ECW or Attitude levels) such as Crockett and Watts' promotions.
and MMA has more in common with Boxing than it does with wrestling.
since MMA heavily involves grappling, that being actual wrestling, I'd say this is erroneous as well.