About 2 months ago I predicted November 2014 will be when DRK overtakes LTC. I was way off, but I think it's still going to happen in the next month / year..
I said that back right before RC3 and RC4. Would not have been far off if we hadn't forked and price plummeted. Darksend is a niche product, despite the ginourmous market cap it touches. But yeah, not everyone will rush and jump straight in until it is absolutely solid.
InstantX on the other hand... if we get this baby out in the open working fine, we could still see it happen before new year's eve

(happy thoughts, wishful thinking, fingers crossed)