But its fundamentally different with e-books. A price-cut at one retailer is instantly available everywhere. And so book retailing becomes a virtual "race to the bottom" - where everyone is forced to accept the margins of the craziest guy in the room.
And that's wrong in which way exactly? That's how competition in a free market works. Setting a minimal prices so that the best competitor cannot leverage his better margins is exactly the opposite and is the reason publishers decided to go that way. They realized they were doomed in a free market and decided to make the market not free.
Apple has all the resource to compete in the free market. Microsoft did just that with the Xbox, gaining market share for years against Nintendo and Sony until it became profitable. They invested a lot, starting from zero market share, and now they are a key player in the market.
Apple doesn't need any price protection, and neither need the traditional publishers. They need to realize that either you adapt to the new rules of the game, or you go out of business. Trying to keep the old rules relevant is a losing proposition, just like trying to keep the music CD relevant in the age of iTunes is a losing proposition.
The problem is, publishers are not willing to adapt. They still want to milk a dying cash cow, and trying to keep it relevant when the market is headed another direction. The return of the wholesale mode is not going to change that, and neither is them keeping the Agency model. With the Agency model they are only delaying the inevitable.