delericho
Legend
No, please. A player should need one, and only one, book to play the core game. Requiring two books falls into "barrier to entry" territory.
Requiring the DM to have three books is equally a barrier to entry. The approach I've put forward only requires one book from anyone. As I said, the PHB is a supplement.
If you want to have a "basic" version, and then an "advanced" version with three books, I'm okay with that. But the advanced version should still be just one book for the base player.
The problem with that is that you then have two entry points, confusing new customers. When someone walks into an FLGS and asks "what do I need to play", it shouldn't be an invitation for the staff present to start debating whether they want the "Starter Set", the "Player's Handbook", "Heroes of the Fallen Lands" vs "Heroes of the Forgotten Kingdoms", or whatever else. It actually matters much less what the answer is, than that there is one clear answer.