For what it's worth, this is the KLM /AF approach to 'Lifers'.
"Become Platinum for Life
Of course, as a Platinum member you can carry over your Level Miles to the next year, making it easier to maintain your Platinum membership. After 10 consecutive years of being a Platinum member, you are rewarded with a Platinum for Life card. This means that you no longer have to reach the required threshold and that you will continue to enjoy all privileges you are used to, every time you travel."
I guess I will run my miles down to Zero eventually, but still retain the card I've had for a few years now for the rest of my life, unless they change the rules or maybe are taken over or disappear.
ps And you do not have to take anymore flights at all, once you achieve the Lifetime card.
Last edited by mike turnbull; Sep 28, 2015 at 2:29 pm