I think this is where I am. At this stage, with 1/3 of the season gone, I think it's worth giving the job to ST to the end of the season with a play-off position as his target. If he doesn't achieve that, then we recruit a new manager over the summer with a budget to bring in players as needed.
I completely get L1F's point about needing 4 better players. At the same time, it's a shame that all fans (me included) think the necessary remedy these days lies in the transfer/loan market. Every club, whatever its status, seems think that's the quick and easier way to go, rather than coaching players to play better, more consistently (yes our performances have been poor overall but we've seen potential in certain passages of play). ST is popular with the squad, it's said, and is respected as a coach. See what he can do.