I have many thoughts on this, so hang with me here... Personally, I reject the notion that bowling is "dying" in several ways. I'll spare you most of them here, but to say I'm aware of the situation I believe you're referencing here and have been for some time is actually a bit of an understatement. Happens my initial contact with the PBA was facilitated by a couple of filmmaker friends that made a terrific little doc a while back called 'A League of Ordinary Gentlemen' that covers this topic very well.
Think about a plant, one that started small and grew over time to be very very big. As the plant grew, you'd buy bigger and bigger pots for that plant to expand into. To live and thrive. Then, over time, to no fault of the plant's... that huge container it ended up in started to break. It'd had a great run. But it was time to start shifting the plant back down to a more medium sized pot that made more sense. After a little trial and error, you'll eventually find the pot that the plant fits in just right. The perfect size to fit the plant and help it live it's healthiest most fruitful life. And over time, you may have to change the pot again. Maybe bigger again, maybe smaller. Who knows? But with your love, that plant can live as long as it's given the care and right size place to do its thing.
Yes, it's an imperfect metaphor but I think that's bowling. It's not gonna die, the audience interest and the support will always be there from those that truly love it. That size and fervor of the global appetite for it will shift over time, but it'll never go away.
In large part, this is actually one of the big themes I carried with me throughout the making of the movie: finding that right place in the world, where you fit. Does Cassie really need to do what she thinks the whole world, and especially her deceased father wants her to do and get married before she turns 30? This even helped me realize why Louisville was the perfect place to shoot the movie (besides my obvious bias having grown up there). It's an amazing town, and I love it dearly. But as long as I've been alive, it's had an identity crisis: does it want to be a bigger city than it is? Is it too big for itself already? All the while, it's perfect just the way it is. Will that stop the efforts of many to try and make it "The Next [Insert Latest Cool Big Town Here]"...? Absolutely not. Several other characters and decisions throughout the movie rest solidly within this overall idea, but I'll leave it at that for now.
Bowling isn't dying. Sure bowling ain't what it once was, but that's just fine.
Bowling's gonna be just fine.