My experience is that this field is very, let's say, business-savvy, so it's safe to say they'll figure out how to profit off of this.
Most dentists that I've been to have more business than they're able to serve, so I suppose their client base won't dry up too soon - especially that such procedures are bound to be expensive - at least initially.
Then there's orthodontics, because who says that this new tooth will grow perfectly straight?
I mean there are other good reasons to brush your teeth apart from just tooth decay. Your gums are important too - also if you’re ever going to kiss anyone, they’re probably going to prefer your mouth not smell and taste like a decaying corpse.