Note that Bitcoin Clearing Houses don't centralize Bitcoin.

Such clearing houses have no power to create coins or prevent their transfer (users could revert to the core network).

A rudimentary form of this already exists. See https://en.bitcoin.it/wiki/Green_address

Mt.Gox provides green addresses and a few merchants recognize them (see bottom of the above link). Mt.Gox also conducts an estimated 80% of all bitcoin currency exchange. It probably holds sizable coin storage for the community too.

Mt.Gox could already act as a Bitcoin Clearing House, in other words. That doesn't mean Bitcoin is centralized.

Note: I think it's unwise to store a majority of coins with one eWallet like Mt.Gox. A BCH, as I see it, only holds a small balance of user's coins, the amount they expect to usually transfer. Users should probably drain their balance periodically too by default.