Anachronistic then BB? Sometimes those memories you mentioned in the main article can be preserved by a comforting lack of knowledge.
The world is shrinking and Rugby has a very large part to play in this necessary, nay vital, process.
The culture that surrounds Rugby transcends borders and we who have been lucky enough to have Rugby as a training tool can recognise each other just about anywhere and everywhere. Not something with which mere nationalism could ever contend.
Whatever raises the standard of Rugby is good for Rugby. For Gareth if his dream is made of many parts of which only one component is being an All Black then seek advice from someone he trusts, maybe even someone called Warren. Playing Test Rugby is the ultimate and he would never be ostracised in NZ should he decide to have a crack. Having international swaps like this is great for the game. Go for it. Limiting his opportunities for medieval considerations is not even an argument.
While you are over there could anyone from the 'Tahs tell Benji he would be welcome in the Rebels squad. If he is considering a code re-switch to think again, maybe he just needs to get away from the glaring spotlight that is on the Blues.