I've been using Poloniex for years. It was the best exchange, and I made good money with it last year. It's more difficult this year, cryptos are down, and there's more competition. Still, when the market will go up again, I'm sure plenty of people will return to poloniex.
They wont return if poloniex wont able to resolve or arrange on the mess that they had done. Support gone bad, verifications takes too long then what we would expect? For sure traders or users would jump out and find another exchange. Competition is fierce and we cant really deny the fact that Poloniex wayback is the most popular exchange and when it comes to volume it is on top tier but now things has changed. Poloniex is currently now on rank 35 based on overall volume which is really going down even more.