On the positive side, over the past two-three weeks, whenever we've had the increased volume Bittrex has account for about 65-80% of the volume. So, to me, it looks like people are beginning to realize the benefits of Bittrex's faster confirmations and, IMHO, better interface. If only they would lower their withdrawal fees, they would be spectacular.
RE: Poloniex increases confirmation times for Gridcoin to 999