When do you think '50s nostalgia was phased out?

It's interesting to hear that you believe '50s nostalgia was phased out in the Late '90s, because like I mentioned in my original post, I can distinctively remember hearing references to '50s rock 'n roll in many lifestyle/travel programs even as recently as 2008. Coincidentally, I actually watched a 2007 episode of an Australian travel program called "The Great Outdoors" just a couple of days ago and there was a brief segment where they promoted a '50s rock 'n roll festival in Adelaide. I guess it likely would have varied from country to country. 

While I agree that '50s pop culture will likely remain ingrained into pop culture for the foreseeable future, I do have my doubts about whether it will remain ingrained permanently. I think we will eventually get to a point where the 1950s have no connection/relevance to the current generation whatsoever and subsequently, any remaining nostalgia for the 1950s will be phased out for good. 

I remember RockyMountainExtreme made a thread not too long ago about how the 1950s are fast becoming a "dead mans" decade and I believe that is really starting to ring true. When you think about it, the year 1950 is almost 70 years ago. Those who are old enough to have substantial memories of the decade are either now well into their retirement years or are becoming increasingly frail. In the not too distant future, we will get to a point where no living person has any memories of the 1950s. The influence of the 1950s on current pop culture will gradually decline as time progresses.

It was starting to become passé around the late '80s, when stuff like The Wonder Years, Dirty Dancing, and the musical comebacks of certain '60s musical figures or styles rendered the carefree utopianism of the 1950s an obsolete escape. It had still been going pretty strong in the mid-80s with Billy Joel's An Innocent Man album, Back to the Future, and a fair number of rockabilly-style tracks still achieving reasonable success.

1995

I feel that the '10s will be the last decade in the long run for '50s nostalgia in the media appealing to those who actually experienced the decade rather than those born after who just have a niche idea about it.

At the start of this decade (2010), those that would've been between the ages of 16-20 at some point in the '50s were 67-80 years of age, which is not young, but not too old, still young enough to where they're still lively, self-reliant, and independent, many of them were even still working and hadn't retired yet at that time.
Come 2020, they will be 77-90 years of age, and will either be at the tail end of their days of being self-reliant and independent before they're going to need assisted care, or are already at the age where they need assisted care, plus many of them are dying already.

I do believe that late '50s nostalgia, which ties into early '60s nostalgia, may have its last gasp in the 2020s however. In fact, just earlier this year, I saw an infomercial on a collection of songs from the late '50s early '60s, which was targeted at those who were youth age in that time period. That infomercial could last into the 2020s if it works in 2019.

It’s like with Meghan Trainor in 2014. Her songs All About That Bass and Lips Are Movin were heavily inspired by late 50s early 60s Doo Wop.