Dont worries for exchanges, a lot of project are listed on ether delta first but its not an obligation, and I think soma will be listed in many exchanges and main exchange. And even if soma start ton ether delta, the project will be listed soon after that on different exchange Im sure about that.
yes, etherdelta is like the inital startpoint of every token so far, it is incredible.
thats why i want to hear,, if there are some bigger exchanges already in talk to get listed soon after ico.