Wales head coach Warren Gatland said: "For me as a national coach, if I was being perfectly selfish, would I have a policy?" Under the new system, stars playing outside Wales will only be available for global selection if they have won 60 caps or more.
North, Roberts and Faletau have more than 60 caps, while Williams had already started playing for Saracens before the policy changed.
The Welsh Rugby Union have announced that players with 60 or more caps will available for global selection regardless of where they play their club rugby.
However, Gatland did confirm that he will use the next three weeks ahead of the autumn global to speak with those players overseas about their intentions and whether a return to Wales is in their future plans, with the British and Irish Lions coach ready to consider dropping them if they don't figure in future plans.
But, as this new 60-cap clause comes in, the former "Wildcard" system is removed in its entirety, meaning no player with less caps will be selected for Wales if they ply their trade outside of the country.
"I have given 10 years' service to the Ospreys and Welsh rugby and have picked up injuries along the way".
He says the best thing is to try and keep the best players in Wales for "as long as we possibly can".
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"We have got a target of announcing the new Wales head coach by the summer of 2018", Davies said.
"But we have spent a significant amount of time with national team management and the regions evaluating its merits".
Welsh coach Warren Gatland expects the change to provide a lift to domestic rugby but admitted he would rather have a free hand on selection. The existing policy worked to an extent, but it has not worked well enough.
Phillips said: "Whatever contract that a player is in today, that contract is protected".
"This new policy is pretty much black and white". If they have 60 or more caps and they are outside Wales they would be [eligible].
"We also recognise that players will reach a stage in their careers when the draw of an overseas contract may become overwhelming". From my point of view we potentially won't be able to pick a world-class player.
WalesOnline says the law states that "only players who play in Wales will be eligible for selection to the national squad".