We will see. I was on a BB PRIV for 3 years, never changed anything on it and it still works..it's just..super slow and didn't age well. Battery still holds full charge and can last a day. One thing I learned from it though, never use an OLED display on maximum brightness. I ended up burning a game into the screen lol (was really into Yu-Gi-Oh Duel Links at that time, you can still see the life points on the edges). So from day 1 I only used the Pro1 on half brightness. (currently I am really into a gacha called Princess Connect Re:Dive)
So far I had no problems with anything. Hopefully it stays that way. One major thing I dislike is the state of stock android...especially that sound crackling bug in games. I am legit more worried about getting stuck on crap software than my hardware failing now. But in the worst case scenario I'll just move to Lineage.