Hehe, I love this question :) My response is probably way longer than you expected, sorry if it's a bit of a novel o.o
I've been poling for about 1 1/2 years, a bit longer. I always really liked it, but my real pole frenzy - like, think-about-it-all-the-time frenzy - didn't really start until about a year in, when I got my basic invert/outside leg hang. That was a big win for me because I came into the sport with NO upper body strength, and once I got that I started to feel like I could really work on what I wanted to do. I had felt really stuck and kind of hopeless up to that point, which did ruin some of my enthusiasm, but after that I really took off and started *getting* things. That was the point when I really knew this was my passion.
One thing I can say for sure is that I've dabbled in so many different things throughout my life - fitness-related and otherwise - but absolutely none of them has stuck the way pole dancing has. I tried some dance classes (as well as music, science, art, etc.) when I was younger, but everything felt way too strict and structured for me and any real joy I got out of it was sucked out by the strictness of it. Zumba/biking on my own wasn't super structured, but I never felt like I was building towards anything I could identify. Pole dancing, on the other hand, is the perfect balance of structured teaching and self-guided play. I never feel like the structure of learning sucks the joy out like it did for everything else, but I have enough guidance so I can learn safely and feel the difference in my own body every day. I am stronger, more flexible, and more body-aware than I ever dreamed I could be. I can do things with my body that I never thought possible for me. I never thought I would end up realizing that my big passion in life is the wonderful mix of dance and acrobatics that is pole, but I did, and it's *awesome*.
That's why I definitely see this being a lifelong passion and not a fleeting interest for me. Hopefully that made some sense, and perhaps some of that resonates with you :)