Sure, Sprint should do that, but it's probably not going to happen. On the other hand, we have the resources to pool our knowledge and experiences in this forum and assemble a useful list of BT devices and information about how well each model works with the Mogul. This has been done nicely in these forums for other PPCs/Smartphones, but I'm not sure it's really been done comprehensively for the Mogul, even though the Mogul is probably the quintessential example of a device that is crying out for such a resource.
If such a thread exists already, it might be a good idea to make it a Sticky. But the closest thing I've find to what I'm talking about is this thread:
http://forum.ppcgeeks.com/showthread.php?t=5221&page=19