I think auto is too much like a few have said, as well as doesn't guarantee that the WHM is actually ready (where's our ready check?). Give conjurer or arcanist an AoE ability the likes of swiftcast that turns single target spells to AoE. Using the similar skill SCH has in FFXI is makes Healing or buff single target spells AoE doubling cast time and MP cost. This would make the recovery a bit faster and even have use in some combat situations. Example such and aduqulin AoEed to Galvanize for an incoming big hit for SCH or the AoE stoneskin for WHM. Would be interesting if it was a arcanist skill and BLM had access to it to idk AoE flare perhaps?
Recovery is already fast after a wipe. Even is it was auto, usually, unless no one cares what went wrong and pass out a few hints, advice and/or pointers, there is a bit of talk to prep before another go.