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Vaccines don't last forever. Do you know anyone who got shingles? That's chicken pox, or understood to be chicken pox. If you had it as a kid, you have the virus and when the virus gets powerful enough, you'll get the shingles.

I don't follow your reasoning. If a vaccine is not perfect, doesn't last forever for everyone, we should stop getting vaccines?

Your reasoning does not make sense. If you get chickenpox as a child, you should have lifelong immunity to chickenpox. You will have a risk for shingles as you get older, and there is a vaccine you can take to prevent shingles. If you do get shingles, in most cases it is not life threatening.
However, if you get the chicken pox vaccination as a child, you run the high risk of losing immunity as an adult. How many adults in the age 30-50 range get vaccinations? None. They are too busy working and raising a family. The vaccine could wear off, just like we saw with smallpox. There is no statistics yet for duration of the chickenpox vaccine, because it is new. But there is quite a bit of speculation that the immunity wears off as you get older. You can die if you get chickenpox as an adult.
I would rather my kids ( which I do not have, but if I did) get chickenpox than take the vaccine. If the herd immunity is too strong, then I would vaccinate them at age 17.
I think in the long run, we are going to see decreasing immunity, adults too busy to get re vaccinated, and death from chickenpox.

It seems like everyone I know has had shingles lately so I went down and got a shingles vaccination. It uses a live virus and made me really sick for 2 days....but I would do it again.