Your question implies that you assume only your age demographic is reading/watching.
The Hunger Games series has attracted people of many ages. I mean come on, my GRANDMOTHER is hooked on it. Your question is a bit unfair though because you assume that you and your peers are surrounded by like-minded and aged fans of the series, going crazy over another love triangle.
If you mean tweenies who just caught the tail-end of the Twilight hype and want to emulate school friends and/or siblings with "their own thing," then yes, I have absolutely no doubt that there will be a screaming fanbase of little girls (and boys) with home-made T-shirts with their "ship" on it.
However this doesn't hold true for everyone. Most surprisingly though, I have faith that the initial fans of Twilight will be the ones to keep their composure when it comes to this franchise. This has taken YEARS, and IN those years we (meaning MY age demographic, which is 19-22) have grown. We made it to see Harry Potter be put to rest, and in the middle of a beloved series going, we latched onto the nearest thing to emulate our raging hormones at the time (a.k.a. Twilight). During the years of Harry Potter dying, Twilight gaining hype with the youngsters, and getting mauled by over-enthusiatic underlings dressed ridiculously in theatres, our attention spans and intelligence level have grown (in most) to encompass more than angst and true love.
The reason I believe the initial Twilight fans will make the best Hunger Games fans is because we lived through (and occasionally initiated) the waves of screaming insanity for an undead virgin and an angsty fur-ball who has a problem with shirts; I don't know about you and yours but I'M definitely NOT looking to be a repeat offender. We have grown enough to appreciate intelligence and strategy in our literature. We had the Twilight series to assuage our hormones, now we need The Hunger Games to help us through life's "struggles."
And it should be pretty obvious why the older generation will not deteriorate into a puddle of emotions. Actually, my grandfather has read the first book as well and he enjoys comparing it to our government today. Granted he's neurotic and paranoid, but my point is every generation tries to find the point in a story that pertains to their current lifestyle.
My answer to your (slanted) question; EXPECT the screaming tweenies, they'll crawl to anything exuding pheromones. Have faith in the older generations though, we've got the years and experience on our side to help us comport ourselves with some decency.
smile