the answer to that is, IMO, you'll never know. and that's good. and it's all down to interpretation, which is also good. it's good to have parental support, but it comes down to the person at hand, what happens, ultimately. after all, if it were really up to the father, some would say that every artist would have needed their father, then, to have made it. and some made it without them. and, while some may really have a problem with the thought, there are those who will say that Tina could have not made it without Ike. and of course, there are those who say that she could have made it without him, and those who say that TIna did make it without him so, that would justify/allow those who would say that MJ could have made it without his dad, and those who say MJ did make it without his dad, no matter what it seems to look like. (dad wasn't ready to let MJ in, but mj found a way to be heard, and it impressed his dad, among other things, such as MJ's voice was the main engine that carried the entire family from that point...etc.)
so...what ifs are just that.