To be clear, before carrying on with discussion, it makes sense to first identify what the OP means by a "return to the Dark Ages" before trying to determine whether or not it might be the case. I see all kinds of worrying things going on in the world today, though I'm not sure of the validity of the comparison with Medieval times. While some issues we currently face may be similar to problems faced by human civilization for millennia, others are new problems which we have never dealt with before (e.g. anthropogenic climate change, depletion of natural resources, etc...).
