I have contacted coinader echange to know why they have removed ninjacoin from the market. The answer was:
We have to remove, because a lot of fork coin in user transactions. we have to clear database.
And they can open the market again with a clean database.
This mean that every exchange can add ninjacoin to a exchage !
Yes sir, all bittrex has to do is update to the new fork, I just wish they had a way to distinguish who put on legit coins and who put on the bad ones and track the trading so people who bought earlier but left them on the exchange could still get them. (not an expert don't know if they can or not, I assume not)
so what will happen to individual balances on bittrex if they switch to new fork? if they "clear the database" and started again from Zero, they'd still have their old wallet.dat and when put to the new wallet (1.2.2) would probably have a shwack of good coins it still.
I'm not a exchange expert too but maybe they can store the balance of each user in percent, clear the database, switch to the new wallet and distribute the good coins in the percent they stored. I think most of the trades after block 14000 was dumping and some user would have more percent of NJA than the others but we could accept it as a bonus for user that pay real BTC fot it.