I suspect (a fair proportion of) the initial crop of tourists are already aware.
The risk isn't really that high, though. It'll only become a real concern once things start to scale up. Then we'll have to clean up orbital space. The real problem is dealing with the occasional solar radiation surge. Bigelow's baseline designs were sourced from NASA, though, so I suspect they have a plan for that.
Ah, it might be as much a matter of my interpretation skills.
But anyway, it's still true that the real danger is radiation. I would be interested in finding out whether they intend to shield part of the station or just schedule visits around solar flares . . .
Large orbital debris is tracked, and manned spacecraft take efforts to avoid it. Natural stuff like meteoroids and whatnot are incredibly rare, combined with the fact that space is really, really, really big this makes getting hit by such things far less likely than, say, getting hit by lightning.
I wonder if this will be included in the brochures.