I've had mine pierced since I was 13, I don't know if it will ever close up. But I had gotten to a point I didn't wear the ring much anymore anyway, my uniform irritated it.
I have an old one that I got a weird stretch mark between the site and my belly button last pregnancy. I had an appendectomy a month before I conceived and have a laparoscopic incision site under my belly button. Needless to say, it's quite odd looking these days, along with having a hairier than normal belly! Gross!
My belly button has always been super deep. I doubt it's going to poke out.
Lol mine never did but i always wore a pregnancy belly ring to cause i was so scared to lose my peircing even though ive had it for years