As everyone is saying - there is a lot of water on the bow... but for how long, the popularity of the sport is certainly increasing, as is the population base in Alberta, and with these increases will come increased opportunities for commercial ventures and recreational angling. I think that licensing guides, as is done in many areas (BC for example) will help to ensure that there is "lots of water" for all uses, including commericial ventures, as the city and sport continues to grows.
Having said that, when I get to a pool and there is someone 'parked' for the day I exchange a few polite words wish them 'tight lines' and move on.
Lets all takes this energy get a bit mad about a bass pro shop north of the city... time to enforce the "support your local fly shop" creed.