The tempered packet conjecture

Let $bbG$ be an $bbF$-quasi-split connected reductive group and fix a Whittaker datum $(bbU,bbpsi)$. Tempered packet conjecture. Every tempered $L$-packet contains a unique $bbpsi$-generic representation.

The existence of a generic member is attributed in the source to Shahidi's tempered packet conjecture. The supplied text gives no resolution status.