Yes, the dumping is a problem but it will be dealt with if it continues. An even bigger problem though is the number of coins held in the exchange wallet; we've talked to several whale-type people and this is the biggest issue they have, they want to see a better distribution of coins before committing money to the coin.
Not so sure that is so easy to fix unless the price stabilizes at a decent level. I'm always surprised how many people keep their coins on an exchange to begin with.
If you really want people to get their coins off the exchange, give them an incentive. Go with a marketplace discount model like I mentioned, based on coins in the wallet. Use ipo funds to cover it, if necessary.
Offer up a buy wall at 4K, eat up the dumpers. Rent machines, increase multipool buys.
There, problem solved, not so many coins on the exchange anymore. Or at least not so many on the ledge ready to dump.