You are right from a shallow angle, there isn't enough demand to absorb the selling pressure, therefore the price is declining. I'm asking further, is this normal sell pressure or someone with a purpose? Bitcoins have been coming into the system at a rate of 3600 per day for a while now. Yes, there are more merchants taking Bitcoin, I suppose you could make the argument that the selling pressure is from people spending and the merchants converting to fiat, but I subscribe to the belief that these coins are purchased off the markets.
Take the sell on bitstamp not minutes ago, 400 ($130k) coins straight into the bid.
It's panic and for a good reason.
When we were at $680-$500-$400 (and even more of course months ago) etc anyone just dumping his stash into the bids would have done a perfectly sound move.
If BTC goes to $150-200 (or even lower) for example dumping now is a decent move still.
Also, merchants who accept BTC just market dump on exchanges through BitPay (read their terms in their site), the sell pressure can't get any more direct than this.