So I picked up a Bluetooth dongle and have plugged it in to test things out.
It works quite smooth. Not really any big issues.
If you want to switch to another person though, the first person has to disconnect from it. That's ok so people are not bumping each other off by logging in after each other. A 2nd unit can connect via BT after the first person and it looks connected, but only the first person playing anything will get priority it seems.
If someone is hogging the unit, the only way i can think of to get them off is to reboot the Air.

One other weird thing is that in BT mode using Bubble on Android, my volume maxes out at 25 instead of the usual 100. Moving at increments of 5 means the unit volume goes from 0, 20, 40, 60, 80 and 100% with nothing in between. I think i can set this value differently in Bubble but if i set it to increments of 1 and then i go back to a different renderer for playback, it would take me awhile to change the volume on a 100 scale.

On a side note, i swear the Air sounds more bassy using BT than wifi. This is something i have yet to test more thoroughly.

"Those who preach the myths of audio are ignorant of truth."