I think the hype Tonga has created has proven so far that high profile players switching to these pacific nations is actually a great result for the game. Tonga are selling out stadiums consistently, creating great media hype and adding to the international depth. If Samoa can achieve something similar then surely that is a good thing. I do feel for NZ but players are knocking back Australia as well. We could get 6 nations with the talent available (Aus, NZ, Eng, Tonga, Samoa, Fiji) up to a similar level of competitiveness. People forget Fiji beat NZ last time they played and since have produced two new exciting wingers (though wingers they are not short on) just this year for St George and Parra.
The Big problem for Tonga, and Fiji (not so much Samoa) is quality halves. If these oceanic games can successfully create a good enough profile I'm hoping some guys from Super Rugby might consider making the switch to league considering there is a hole there ready to be filled for someone with a bit of a kicking game, but that is hopeful thinking.