That support was only a speculation based on what the chart showing to us. Basically, it was just the result of graph calculation. $15 for Dash might be possible if it will fall down below $45 but this altcoin was one of the good choices for long term hodl and the demand to grab dash at a lower price is always high so I believe that it will never go down to $15. Who knows? The altcoin corrections already went down over 90% so any prediction might happen.