Could it be that they're waiting for BB10, like most developers? Until BB10 is market-ready, I don't see a lot of developers investing resources into it.
Nope, they are not waiting for 10. They are quite confident that enough profit can be made with the iPads, seeing that OS 5 and 6 gave nothing but issues on both the hardware front and the software front. I can mail you the 6 9780's that I have which died from white screens and other failures if you'd like.
I know that the PlayBook has seamless integration with a BlackBerry smartphone, but alas, you are locked to.. OMG.. a BlackBerry. With the Nexus 7, I can nearly take any device powered by Gingerbread or newer and tether it. Google restores my calendar, contacts, and other information to a new device or between other devices. I recall Google being able to doing that before the PlayBook was released to the masses.
I could care less about the speakers as the device is designed to entertain myself, not piss off the people around me. If I wanted to watch movies, I'd bring along a notebook on my travels and not burn out my eyes focusing to a 7" screen.
Now I am not going to continue to fuel ssbtech's responses, because they are one-sided towards RIM, with a lack of knowledge about other devices (or so it would seem). I've had my chances to play with the Playbook, various Android devices, and a few Apple devices. Android was the definite choice for myself, and iOS for the employer. RIM has proved to be little worth to my employer, and the only reason why we continue to use their hardware is due to a corporate decision (buy-out of my employer). If we did not have a corporate influence, we would have dumped RIM some time ago.
My responses are not fueled with ignorance, but with the experiences of having to deal with a phone manufacturer that just simply was interested in pumping out devices with a lack of quality control. I will say that my work phone (9790) is a lot more polished in that regard, but it took RIM too damn long to correct those flaws.
Sorry, but there is no way that myself or others that I know that have faced these issues will be turned back to RIM.