There is definitely not a cure for cancer/HIV that scientists are sitting on. Y'all need to put down the pipe
But yes, I think they will find a cure for HIV, seeing as they've selectively cured it effectively a couple of times. The problem (well, it's actually a good thing) is that all cures have to go through years and years of test trials before they come to light so when we hear news stories about a new cure, it means something worked once in a research lab. The cure then goes through at least 7 years of clinical trials where it has to be proven safe for human consumption, consistently effective, etc.