Amanpuri Exchange has all chances to go in to top-20 of exchanges with active community and IEO support. Just watch information about Bitmax Exchange, its new but already has popularity and good trading volumes.
In the top 20 to enter practical not really. It needs to attract a lot of traders to the platform , and it costs a lot of money. There is another way , but to go for him to make something new, which is not yet on other exchanges. In this regard, I like the exchange Bibox. Watching its development for about a year.