Yes, we would all like to see more BTS trading inside the DEX. It generates fees for the network. It is the real use of the token. This represents actual use of BTS (not just speculators buying, selling, or hodling BTS).
Yes we want more people to move BTS into their wallet, and use it to trade on the DEX.
However, sometimes I get the impression that some people want 100% of the volume of BTS to be internal to the dex, with no trade between BTS and BTC/CNY/USD happening on poloniex or btc38 or other exchanges. But that would cause a big problem!
BTS' internal market mechnisms rely on witnesses to provide price feeds to the blockchain, telling it the price of BTS relative to that of smartcoins. The blockchain needs to know how many BTS a USD is worth, how many BTS an ounce of gold is worth, and so on. It needs to do this so that it can enforce margin calls on the smartcoins, so that the peg remains in place. Without the price feeds, the system doesnt work.
The value of the price feed relies on the price of BTS on poloniex, btc38, etc. If those trading markets are too thin, it allows huge spikes in the price of BTS, which then results in too much volatility in the price feeds, which then results in margin calls and the internal DEX not working.
Therefore two things are needed:
1) We need solid volume on external exchanges (polo/btc38), to provide a good price feed, and keep voluatility low enough that we dont have extreme black swans.
2) We need solid volume on the internal DEX, representing real use of BTS.
Both of these are beneficial to BTS.
Obviously we are doing better so far in terms of BTS volume on external exchanges, so getting more volume on the BTS DEX would be good right now. But we should always keep in mind that our gateway from the BTS world to the outside world is also important!