personally i think it has a good chance. top-30 market cap, is higher than many of the ones POLO is delisting. but there is no guarantee, and they give no warning before they list the coins.
however one thing to note is that it benefits holders to keep ARK in their wallet, to stake, and not on the exchange. Exchanges don't like that. But then again there are others (i.e. LISK) which they have on polo.
So then why on Bittrex there are sell offers for more than 1000 BTC? And they just stay there, nobody will buy because some of them are ridiculous! For instance:
0.00099999 50505.00000000 50.5045 837.8564
0.00500000 16237.64368774 81.1882 1156.1720
100k, 500k satoshi... I don't think ARK will ever reach 500k. Why these guys don't vote and make some extra ARK every day? They can always sell if the price goes up. Maybe they don't know about the voting thing...
There are always sell orders like that placed on most coins. People (and whales) hope some fat fingered user will put in a super high buy order by mistake and the seller will reap a windfall profit. Simply ignore them and be careful with you math!