The best way to figure out what this will mean for BTS is to research how ripple works.
The idea is that anyone who runs a BTS gateway can seamlessly issue IOU's in return for deposits they receive, and if the issuer of these IOUs is trustworthy then they will be worth their nominal value, and can be traded on the DEX (internal decentralized exchange) for bitassets, BTS, or even the IOUs of other gateways.
So if bter.com decides to become a CNY gateway it means that you can send them CNY and they will send you the IOU token bterCNY in return. Holding bterCNY in your bitshares wallet is as good as having CNY on the bter exchange, and on the DEX there will be bterCNY markets, such as bterCNY/BTS, bterCNY/bitCNY, or bterCNY/btc38CNY that function just like the bitasset markets we currently know (except no leverage/shorting). In addition to making the aggregate market a lot more transparent, it also means that people no longer have to deposit their BTS on to bter.com if they want to trade it for CNY, increasing security and reducing exchange centralization.
What makes this even more mindblowing is the fact that bitcoin public/private key pairs will soon be useable on the bitshares blockchain, meaning that you can send bitshares directly to bitcoin addresses, and the owner of the private key for that address will be able to use the coins if he runs the BTS client and has imported his private key into it. This enables extremely convenient onramp systems where you can send bitcoin to a gateway address (the bitcoin address of someone running a BTS gateway), and the gateway will instantly send you IOU BTC back to the bitcoin address you sent them from (remember that these IOU's are tokens that reside on the BTS blockchain). You can then instantly go to the bitshares DEX and trade the BTC IOU's for bitBTC, BTS, bitUSD, or whatever you want. BTS is then essentially directly integrated into bitcoin, and any bitcoin user who also runs the BTS node has instant access to all of BTS' features (almost as well integrated as counterparty).
The gateway system doesn't even need a website or anything like that, all it needs is a server running the gateway software and a public bitcoin address held by someone who can be trusted. There will probably be many delegates and prominent community members who set up gateways like this because it's going to be so easy to do, so we can reasonably expect to see big IOUBTC/BTS volume on the DEX with low spreads.
Once bitstamp begins to issue bitstampUSD as a BTS gateway (like they currently are a ripple gateway), then moon.