No. His term as Head of Fed ends in May. Warsh was named to give the markets a heads up. Stephen Miran temporary appointment ended yesterday, but I guess he stays on until Warsh gets approved as nominations are being held up by some republicans that found their spine after announcing they were not running again. Anyway, then Warsh would get Miran's position and get elevated to Head in May. Then Trump would need to name two to replace Miran and Powell (if he chooses to leave the Fed entirely, which he probably will) positions in May.