Yikes. I knew there was a lot of work on this happening, but I didn't think it had advanced this far.
Interesting dilemma, this. If people live to 1000, then how the hell are we going to support them? There's resource shortages as it is, with hundreds of thousands dying all the time. There's no way that this is workable without massive advances in agriculture and other areas of science. We'd have to basically shut down people's reproductive systems, or the population would grow so fast we'd have a global famine within a few years of this being made commonplace....
Personally, I wouldn't want to live to be 1000. I'd probably get really bored after a few centuries, as there'd be nothing I hadn't done. I'm all for treatments that repair damage to the body - it would mean that healthcare costs for the over-60s (or whatever) would drop dramatically, freeing up resources for younger people - but just making people live to 10-15 times their normal lifespan is just not sensible IMO, at least while we're still confined to Earth...