Do you think that was only because those devices lacked a capacitive touchscreen? If so, then why did every other company have to scratch their mobile platform after the iPhone came along? Why didn't Microsoft make Metro in 2006, after all, the techology was available (I tried a Panasonic Toughbook with a capacitive display way before that).
I agree that others should be credited for their inventions. Both RIM and others like Nokia helped pushed the technology forward, but they did so very gradually. It took an outsider to disrupt the industry (luckily, Apple had killed off the Newton, or they probably woudn't have had the incentive to do so).