Ick won't go away, but often it can be managed and lived with. With healthy fish, good feeding, and minimal stress fish can often fight off the infection to the point where you almost never see it. When dealing with Ick you need to choose a strategy, you either seek to eradicate it, or manage it. These threads often get very confusing because you get advice consistent with both approaches at the same time.
To eradicate, you must remove all fish from the system for 10-12 weeks minimum, and at the same time treat all the fish with an effective treatment. The only effective treatments are copper, tank transfer, or hyposalinity (and hyposalinity has fallen out of favor and more or less lost the reputation of being consistently effective). I prefer tank transfer personally.