I became interested in the fandom when I was 14 after watching a BeastCub video of a wolf quadsuit, but I didn't know about the actual fandom until four years later, when I finally considered myself a furry. And now, well, now I have three fursonas and a fursuit partial. I think I'll be in the fandom for life, I love talking to other furs and seeing their sonas.
Yeah, I'll more than likely stick around even if I succeed in my musical endeavors. Though, a little part of me hopes we're all forgotten as new, more interesting trends come and go as it'll be easier to find cooler furries.
Edit: And maybe the babyfur shit will die out too.
10+ years I've been a furry, so unless something major changes I can't see myself stopping being a furry or having a fursona on anything- at the very last I'll always be very into the art and characters.
I don't even delve into the furry stuff anymore. Just look at lizards my friends link me. At this point, I'm more in it for the community i have around me. It's very accepting and i can say i like dog dicks without being excommunicated (mostly) (also, i don't like dog dicks. Overrated as shit.)
I know it's a little off topic to split hairs on technicalities but here's my take. Unless you consider something a good part of your identity I wouldn't want to be called "a blank" but rather say it's an interest. When people say Whovian or geek or furry that seems to in a way say that's the most dominant part of who they are unless however you're saying your type of job or religious affiliation to which this would apply to a degree
Anywhose to answer the question on the textbook definition yes I do foresee being a furry for a long time ^_^
I am pretty sure I will remain interested in furry/anthro characters at least, I have been for the last 8-10 years, not sure about my involvement in the fandom as a whole.
I have many other interests than mean even more to me, mostly science fiction and tabletop gaming, so it is hard to tell if I will stay involved in this one when I face greater constraints on my free-time than I do now.