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 .