I used Lykke for awhile and had a substantial amount of lkk, but I eventually left it.
There are some things to like about lykke
It had interesting coins way before anyone else, like chronobank and solarcoin.
It had a wide amount of fiat pairs.
It was fast, responsive, and secure.
But, nowadays, there are so many exchanges that can do that and the only thing that stood out was the fiat trading which I found to not be as profitable.
On top of that, the volume was just so low.
Exchanges are up for a tough fight, it's incredibly competitive now and unless an exchange can truly offer something unique and beneficial it will die out.
Just my opinion, but even if Lykke goes about accomplishing what they mean to accomplish, I believe the time has passed and there is too much catch up to do with other exchanges.