I know that one of Anet’s goals for this next year is to strengthen the core game before the first expansion. With that said, one of the best ways (IMHO) for players to explore the beautiful world of GW2 could be tied to improving the economy and crafting disciplines. As simple as it sounds, fishing provides that reason to explore the map (looking for a good fishing spot, etc.) and could help with diversifying the crafting component requirements for all specialties, which in turn stimulates trade.
But, most of all, it’s an enjoyable past time, weather in real life or not. The possibility of catching something or not, is reason enough for folks to really explore the map. I know other posts have mentioned this, but I’d just like to second it. Thanks.