I have been wondering about some of the issues discussed in here, too.
1) If I want to play three copy of any card at a later point in the game cycle, and the core set doesn't provide three copies it might be a little bit annoying.
2) Do the adventure packs provide 3 copies of each card? That would actually be fair-square, since I only need to buy each chapter pack once.
As for 1) I think the most player friendly option would be a PoD method that allowed us to directly purchase the singles we need. For FFG maybe a "complementary core set expansion" type of product would be good. Just providing the cards necessary to have set of 3s of all the core set cards.
Buying multiple core sets seems such a waste though...multiple quest and hero cards don't seem very useful. Still I can understand the collector's to wish to own all cards in sets of 3 no matter what ;-)
Personally I will start with one core and should I really want some of the cards in sets of 3 I will try to trade or - as a last resort - buy another core set. Similar to collectors I want to OWN cards that I use in my decks, but I don't need full sets of cards I am not going to use.