For a city that was giving tickets away a few yrs ago, I don't think its out of the realm of possibility that Tampa's interest will grow and thus attendance will increase. They averaged 17,820 last season which is like 90% capacity and so there is room for them to draw more. With a now Stanley Cup champion, merchandise should be more popular in the area and will also make the owners money. This is also not to mention that the Tampa area also has plenty of people from the northern US who grew up on hockey.
BTW, after the Panthers made it to the finals, the area supported the team for like 2 yrs with plenty of sold out games. And when they moved into the new building, the average attendance for that season was over 18,000. And this area is also filled with plenty of transplanted people from NY, Michigan, NJ, and Boston...not to mention all the Canadians that come down from January to April!!!
Your logic is flawed. end of story.