Guys, Airplay and DLNA are just two standards. They do a very similar job in slightly different ways. One's Apple native, the other's Android native.
Right now, Android outsells Apple at least two to one. There's no question, however, that Apple is going to stick around, because not much of that is people defecting from Apple - it's mostly people acquiring first smart phones.
But we're definitely entering a "Mac vs. PC" stage in smartphone markets - it's going to be both standards, side by side, for a long time.
B&O doesn't have a horse in the smartphone race, they owe allegiance to neither technology at a core level. They have nothing to lose for doing both.
As for opening up the Playmaker - those are good arguments, but I still point out: it's probably running Linux already. It's not clear what operating system it runs, it could be something like QNX, but it's probably Linux. If that's the case, in all probability, the could release the source code to their specific version without doing anything but good. Your arguments are valid, but not the whole story!
And B&O definitely, definitely need to cultivate the hacker market. There are a lot of 'em, they're not poor, they love music (see Reddit every time there's a music-to-code-by thread) and the BeoLab 3 in particular suits the aesthetics of that market.
$0.02 as you know, but there it is.