Style has many wonders, but I guess the most important of them all is that it defines you in so many ways. This is true for a writing style, work culture, a dressing style, a music style or even the unique way you have of eating a cupcake.
On the other hand, in a quite natural way, going "out of style" is a terrible sin in the eyes of many, most notoriously fashionistas (but they're not the only ones). Because suddenly you're out and people don't identify with you. They only identify with the next big thing, and you're not it.
For those interested in all sorts of change, there's a key issue we should address.
We should embrace the fact that styles change, but most importantly we change, so we shouldn't just blindly adapt to what the latest trends tell us. Ideas shape us as much as we shape them to ourselves, and this is key to maintaining a consistent identity.
Another way of putting it: content shouldn't shape us more than we shape our choices of content. Don't just focus your attention on Hollywood box-office hits; dig deeper, who knows what eastern european cinema or argentine animated videos will teach you.
Reinvention is hard because it requires us to understand ourselves to a point where we can know what needs changing and what we're willing to change at all. But at the same time this effort allows us to be more complete and able in personal and professional terms, because our main sources of inspiration are rarely directly related to the outcome of what we're trying to accomplish.