On farenheit too late, I suspect also l'anarchiste though Caron flat-out denied they reformulated the obviously reformulated yatagan in a recent correspondance I had.
I wouldn't worry about opium ph as it is an inexpensive formula, danger here may be discontinuation due to low sales.
Rive Gauche is also a recent formulation and thus most likely doesn't lend itself to easy cheapening as older ones do.
I think the dreamer is discontinued anyway? Not sure, maybe someone can confirm?
Don't know about the others.