In terms of fundamentals, DRK needs to capture just 2% of BTC's marketcap (2016) of such a 18k BTC scenario (~250bn market cap) which would make it a ~5bn coin ~5mn coins in circulation => ~1000$/DRK.
I think the breakthrough for Bitcoin will be a bond market meltdown and subsequent credit crunch.
The breakthrough for Dash will be a Litecoin meltdown when it finally fractures its support line of 0.006 after hammering off it a few times.
And what about possible ASIC scrypt miner breakdown? This will surely follow any price depreciations especially for litecoin, a scramble for the exits in order to maintain income, when not economic and can't sell the hardware and other alts for dumping onto like feathercoin are no longer scrypt ..