Short term it really feels like something has cracked, among supporters if nothing else, and Smith cannot just keep on doing what he's doing.
Personally, and I know I'll probably be shot down for it, but if I were him I'd tell both Hooley and Sinfield they're going to play the next 4 games unless they get injured or have utter mares (Hooley at KR style). Its quite simply time for a change, and picking players in proper positions. Giving these guys a game now and then leaving him out for the rest of the season, or maybe one more game just isn't going to help them develop, or show anyone if they are up to it. Myler can suck it up and sit on the bench for a few weeks, or alternate with Austin. we know what both of those can do, and more importantly what they can't.
I'd also tell Handley (if he's pushing for it) that the only way he'll play full back again is if there are injuries, and rejig the threequarters - get Martin out of there for starters and move Macdonald across if needs be. He can play centre, and we need more attacking threat than he can offer on the wing. Basically stop the 'best players regardless of position' stuff and try to get as close as we can to players in the positions they are currently best suited to.
The other thing he should do is just cut the nonsense out of the gameplan. Focus on position, possession and defence. Not passive defence, but aggressive, stop the yardage defence. Its RL 101. If some of our forwards aren't up to that then they shouldn't be in the team.
Not sure what else he can do otherwise. There's very little chance of a run like last year, this season is done. It all has to be about trying to get some decent performances out of the team for the rest of the year and ideally find out if some of these squad players are actually any good.