You need ICO on platform that have some Volume : ) .
But in reality that volume will come after QUALITY ICOs. DAO was cool concept for ETH then were new one with high explosure.
We have here few token exchanges in crypto long before ETH.
BTS NXT had those exchanges, but ETH was prommising MEGA features to those tokens
...
that was a diffrence and power of smart contract Marketing.
In reality all trade those tokens and noone use ETH network like it was promoted.