There appears to be no appetite by the NHL, or NHLPA to address the current situation, so I think for now it's a talking point. The Canadian government shouldn't be changing their overall taxes, or even a jock tax... If this becomes too much of an issue, it's for the CBA to deal with. While I do believe that there are more and more players, agents and tax experts looking at this, and making some decisions based on it, I also believe it isn't the deciding factor. Sure, a bunch of teams in tax preferred jurisdictions have had success the last few years, but that very well could be part of a cycle too, that is making us focus on it more.
If this trend continues though, it will need to be addressed by the league.