My local BB/Magnolia has the B&W 600 and CM series. They also have entry level Martin Logan, Energy, Def Tech, and Mirage. They used to drive them with Primmare integrateds, but dropped those along with Vienna. I think Sumiko stopped selling to them.
I know people think it's a bad thing, but I disagree. There's nothing wrong with people being exposed to this stuff IMO. They're definitely not nearly as busy as the rest of the store, but they've got a share of people looking around.
If they keep it entry level, I don't think it'll hurt the brick and mortar guys much, if at all. Most people in there wouldn't go to a brick and mortar audio shop anyway IMO. It may also motivate a few to go to one and see what they've got.
I don't think 800 series stuff or Mac and the like are a good move though. My local Magnolia is limited to Pioneer Elete, Yamaha and Denon AVRs and DVD players, so I guess the downside is the customer won't really hear what the speakers are capable of.