Yup. My current one is dying and I'm using it almost always wired to a charger or battery. I don't care how badly they try to waste my battery, I'm not buying a new Android phone ever. If this one dies, I'm prepared to not use a phone until there's a reasonably priced Linux phone.
The answer is likley never, GOS devs dont trust Fairphone devs (due to poor security practices) and Fairphone devs are unwilling (in some cases unable) to meet the extremely high standards for GOS.