The fact that this spins up a Debian desktop when you're in desktop mode seems to make this a much more viable option than some of the previous attempts at this, which expected you to want to use only android apps on your desktop.
If the UIs supported a seamless mode, that would be icing.
It's Android devices after all...
For devices that support a vanilla android, I imagine the driver issue is already worked out and there would be no problem getting them to work in a kernel that you can compile yourself, even if not the default debian kernel.
I realize that some may have a strong preference for OSS software, which a debian desktop would be excellent for.