I'm agnostic about setpoint theory.

For some changes their effects on happiness (either positive or negative) fade somewhat with time, but I'm not convinced at all that it's true for all changes, or that it's typical for the effect to fade down to anywhere near 0%.

Maybe other changes never fade. Maybe it's even typical for changes not to fade. Setpoint theory sounds too much like generalizing from one example.

(not that any of this is related to lack of good name for "preference for situational attributions" or whatever we want to call it)