yes i do believe this is the reason behind price dropping
there appears to be much disagreement still, and this has poeple on edge...
Armstrong wants 2MB now and segwit later, Core wants segwit now and 2MB later.
it seems silly to push the issues so much on a disagreement about the time frame in which these changes will be rolled out.
besides it's been speculated that activating a HF will take longer then releasing segwit's soft fork.
so in a way cores road map is the fastest root to getting more blocksapce ( if they are able to deliver segwit on time... )