The entire Magi platform is built around HBD. If we don't intend to give up entirely on HBD on Hive, I think HBD is a good choice.

There is SWAP.BTC/SWAP.HIVE on Hive-Engine, btw. Of course, that's a different beast entirely.

EDIT: Right now, HIVE is the main link of Hive to the outside world. If someone exits, the entire pressure is on HIVE. On Magi, the pressure moves on HBD, not on HIVE. It also becomes one of the few places that "lists" HBD.