... I think the bigger difference isn't nostalgia itself, but the power of branding. Which is tied in pretty tightly to the fact my generation (and the generations that followed) are the first real demographic groups to have both branding and nostalgia so tightly intertwined...
This is an interesting point, and one that I frankly hadn't really considered. I think you're on to something, however I don't necessarily think in the way in which you might mean.
For example, a lot of the 70s and 80s movies really didn't have strong branding, or even big marketing pushes. These movies weren't drilled into us as children the way Pixar films are drilled into kids today. Sure Disney movies were, but internet denizens aren't clamouring for 'Sleeping Beauty 3'. In fact, a lot of what we're seeing dragged into the 21st century to fuel this "nostalgia culture" (I really need a better term for this) are merely the cult classics. The Last Starfighter, for example, was not a well marketed or monetised film. It was just a fun sci-fi flick that struck a cord with youngsters, and we've had little to nothing like it since. But its "nostalgia value" is such that someone was able
to use its premise wholesale to tap into the "nostalgia culture".
Looking at video games, sites like GoG.com live and breath by selling us back our childhoods one game at a time. Games that, in most cases, had bugger all push behind it besides a box on a shelf. Branding has little to do with the fact that people want them today. I think there is more to it than merely "capitalism", to be a tad reductionist. The entertainment that resonated with youngsters of yester-year is able to be re-experienced so readily today. I think this new-found availability, coupled with Hollywood's risk adverse nature, fuels this demand for "nostalgia". Hollywood has always banked on sure-fire hits, but nothing like what we're seeing today. They're straight-up allergic to risk. Now, we get excited about the prospect of The Last Starfighter 2, not because we asked our parents to buy action figures, but because to our eight year old selves, its the best movie ever, and we want to re-capture that level of excitement. And Hollywood has banked on providing that experience.
To bring this back on topic, this is part of why, I suspect, people are also looking forward to Avatar 2, even if its been 10 years by the time its actually out. Avatar was one of the most incredible cinema-going experiences I've ever had. I walked out of the theatre in a daze.
I know a lot of people did. The opportunity to have something close to that again is worth waiting for, in my opinion. Of course, I'm really just saying "I want to experience Avatar for the first time again". Which is a demand that wasn't readily available until the last decade or so.