Lots of drugs started out as medicine. And heroin is a great medicine, still used in this sense today.
It has been around for 10 years and 4 phones by now, and only gaining in popularity and market share. No reason to predict an early demise yet. The Fairphone 1 controversially only received 3 years of updates, but since then it’s 5 years.
Both Samsung and Google give you 5 years of updates (at least 3 major Android releases + 2 years of Security updates) for a few years now.
Until the first few break down and you need to buy new ones, just to realize they are different from the ones you have by now (or discontinued outright).