I kept my last bike as pretty much an only bike from about 1982 until a couple of years ago. So, say 30 years. It has gone through a few changes and updates over time. But, it has commuted to high school, college, graduate studies, and a few jobs. The bike hasn't been sold, but is probably due to a refit, or retrofit for its 50th birthday (it wasn't new when I bought it).
A few things changed in the last few years including going car-free. And, an interest in experimenting
So, I can't say there won't be a few shifts in the "fleet" in the near future.
But, my big plunge into CF was to build up a 20 year old CF frame
Perhaps I'm regressing, as I have a 40 year old CF frame in the works.
My cargo bike was homebuilt, and I may need to build a better one.