A true hero
Teams: Hull City Tigers
I wouldn't mind NT players coming from the Championship if they were good enough, no. The Dutch NT gets players from it's own league, and outside the top few teams the quality is probably worse than the Championship.
The premier league prides itself on having the best players in the world. Only so many of those players are English. For the ones that do make it, playing against top international players week in, week out should improve them as players themselves. For a central midfielder for example, even against lower table teams they will be tested against the likes of Cabaye, Van Ginkel, M'Vila, Song, Kouyate, Wijnaldum, Sissoko, Fletcher, Gueye, Capoue, Inler etc.
It's the perfect proving ground, and someone like JonJo Shelvey, is capable of raising his game to accommodate that. If the player can't raise his game to get to that level, are they good enough anyway?
And we had no foreign players in the 70's and 80's, dominated Europe and the national team was still shit.