I believe your projection on SGC may well be right.
Once they sort out the debacle in their US Groups, sentiment may well become positive.
There is a further possibility, in that they may well, (as has been suggested), go private again OR may become an opportunistic take-over target.
The latter statements, of course, are highly speculative & in my opinion only. As always in any investment you should only make such decisions based on your own research.
I have however, taken the risk that the worst that can happen has happened & have purchased into Stagecoach this week.