I think this is cool research and I hope they can bring it to market but in the "its cool stage" it just makes it harder to convince your kids to brush :-)

Parent: "Brush your teeth or you will end up with all this dental work like I have."

Kid: "Nah, we'll have regrowable teeth by then."

FWIW, I got an implant a couple of years ago and talked to my dentist about these sorts of things. On the plus side an implant is known to work, will likely last beyond my death, makes my remains easier to identify is an obliteration scenario and is available today. The down side is that you can never regrow that tooth once you've sealed a tungsten post into your jawbone.