Steem hit poloniex, and waves? When this will happen?
They won't until they at the very least have full nodes and can audit them. Even then it will depend on whether they feel like listing it or not. They took forever with Decred.
You can't compare Decred to Waves. Tbh Decred seemed like a scam at the time it was first announced. No offense to the people behind it, it was just my initial reaction at first glance. With Waves coming in as one of the largest crowd funded projects could be taken more seriously. This is all just my first impressions so take it as you will.