I do not see that happening in the long-term. Maybe a few fringe sects, but never the majority.
Instead, as soon as some people use such treatment, most everyone else will as well.
What this conjecture tells me, is that this "culture" is probably just based on the belief that anyone who refuses to accept aging, must be a fool.
If however a cure is demonstrated, this belief will be disproven, and people will quite immediately embrace longevity.
Or.. do you expect otherwise?