I also agree with Liam when he says people shouldn't be bouncing back and forth. Sure switching nations is possible, but is should be a clear choice.

I remember that when I was in Marseille, there were several people playing in the GB squads during the Europeans.
A year later, in Sheffield, I saw them playing for South Africa. I wouldn't be surprised if they would play for GB again during the next Europeans, if they had a chance.

I can't blame them for taking the opportunity to play high level hockey when living in another continent, and understand their motivation.
Nonetheless, I consider it to be pure oportunistic and unfair towards other countries and players who's place they take.

Yes they got some good results, but during the worlds their place was taken by a less talented player, which immediately made an impact on the team. I consider that to be less of a problem during Europeans.
Furthermore it makes the competition less interesting for some smaller countries who would have a greater chance.

In that opinion I have a lot of respect for Bennie Potgieter, the SA who has been playing for Holland the last couple of years. I believe he would have no problem making the SA team, but once took the decission to switch and sticks with it.