how much do you love this top? and how much quilting are you willing to do on it?
in a collection, a small piece of tulle fabric in the same color on the top and the bottom to cover the hole would create a structure while you stitched the sandwich together. with a dense quilting pattern, the hole would never be noticed. but you have to determine if the top is really going to hold up well enough to warrant the work. in a collection, it would be handled with great care, i.e. never left in the sun, never allowed to crease, and most importantly, never handled. if you think you love it that much and are willing to enjoy it for as long as it does last, then go for it.
just remember that if the fabric is weak it won't last forever. it lasted this long because it was put away.