Maybe Poloniex will add WAVES when full node released

Yes... I think they will. It doesnt make sense for them not to... The mere fact that waves is still listed as one of the highest crowdsale results in history should be reason enough alone, although the tech and innovations are more than enough to get waves onto polo. Lets see
It seems like polo does not want add any coins that have decentralized markets like ARDR so I suspect the same issue here with WAVES.
Then why did they list bitshares?
Anyways, I think it would be a very cheap move for them, if they don't add waves because they see it as a competitor. Thousands of people want waves and ardor there and it really makes polo fall behind and lose popularity if they are such shortsighted idiots.
Personally, I don't believe they are stupid enough for that.