Daymond John Credits Mark Cuban for Saving 'Shark Tank'

Daymond John has predicted the success of "Shark Tank" will continue long after the departure of his costar Mark Cuban ... whom he credits for keeping the series afloat.

The FUBU founder has no qualms over Mark's decision to leave ... saying he's already done enough by doing what no other well-known billionaire did ... believe in the show while it was on the brink of cancelation three seasons in.

Daymond says Mark's devotion ran deep ... staying on the show for so many years with his input playing a significant part in making it the cultural phenomenon it is today.

What he means is that if you've ever had dreams of pitching your pipe dream on "Shark Tank" -- that's all Mark.

Clearly, Daymond has forged a strong bond with Mark over the years ... telling us he wishes him well and adding the 'ST' team wants to pay his hard work forward by giving his seat to the next generation of entrepreneurs.

As for who could potentially snag the coveted seat? Mark himself has endorsed Kardashian biz partner Emma Grede as his replacement ... gushing over her experience and TV charisma.