I reckon it's a great idea. And looking at that team it makes me really keen to watch, which is frankly more than I've been for the Lions to take on Super teams without their best 5-7 players.
As for tradition, history etc - Australia only has four Super teams. For a full tour you need to provide 5-7 matches beyond Tests. It's not like we have other rugby teams with history and pedigree just knocking around (well you could reform the Rebels but nobody wants that).
Sure we could roll out a Country side like we did in 2013, but the fun of playing amatuers from the bush wears off pretty quickly as the Lions put on 100+. You could do Australia A, but does that really have any more tradition and prestige than the AUNZ concept? Not really.
Between the AUNZ and the Pacifika/Indigenous side next week, I think RA are trying a few things that may evolve into actual traditions that we can continue in years to come.