I think LISK fails miserably.
How? It has a good community and much potential. Lots of people invested/planning to invest into it. It can fail like everything else, but I don't see a reason why that should happen.
@OP
ETH is already on a dump. Lisk may effect the price a little bit, because traders are paying attetntion and hype LISk when it's released.
But once DAO tokens will be available on exchanges for trade it may increase again.