I kinda think Porter plans on Ottawa as being a hub-of-sorts for connecting flights from Atlantic Canada.
Moncton for example will soon be serviced 3x daily by Porter. One of these flights is direct to Billy Bishop, while the other two go to Ottawa (one transiting to Billy Bishop).
Porter bases their jet fleet out of Pearson, so Billy Bishop is not good for long distance connections, but, Ottawa is. I like Porter. I wouldn't mind making connections in Ottawa. Certainly less hectic than Pearson.