I doubt being immortal would be too easy so even if they find out how to work t his shit there'll be plenty challenges.
But say this shit was ready to go in the next 10 years I smell overpopulation like **** unless they pass some law to kill you when you hit 1,000 or summin lol. But srsly though I'm sure people would still find ways too go dieing.
And back onto my first point there'll probably be some point where you can't "be immortal" anymore and then this doesn't reverse age more than likely either so wouldn't you be stuck at a certain age and say you were like 80 or some shit you'd have tons of aches and shit so who wants to live with that.
Lastly, this might all just be the beginning of a zombie apocalypse : O