So if LEV ever happens at a point in the future for humanity, won't that era be the start of the "best era ever for humanity". LEV doesn't just mean "you live with no upper limit", it means more chances. More opportunities to make things better. More possibilities of a better era. You can start campaigning for social change that will take 200 years to happen and you will personally benefit.

Also even if the first versions of the tech are somewhat invasive and aren't pretty, you merely need to live long enough and if an era of everyone looking like Greek Gods and participating in open air orgies becomes the New Normal, well, you are able to partake if you wish.