It substantially reduces the value of the speaker. I've seen some held together for low volume with tape, but there are a couple of other choices... I've seen small wrinkles fixed well with super glue, but it dries fairly stiff. paper towel or tissue strips with elmer's is another approach, but it gets a bit stiff as well. Lastly, rubber cement will hold and be more flexible, but it will wear and fall apart after a few years.
The good news (might be) that because the D130's aren't as popular as the D120's, you might be able to get it reckoned with a factory kit. Orange county is one of the largest re-coners, so I'd check with them. The longer you wait to re-cone a JBL the less likely you'll get a factory kit to be installed.