The BlackBerry Effect was caused by a company trying to protect it’s legacy core which eventually became it’s Achilles Heel. It will (and may already be) happen to Apple and others who refuse to innovate for fear of eating their young. However, there is an interesting point about this that says ‘If you don’t eat your young, make no mistake about it, someone else will”. The best way to dominate a market is not to attack a strong competitor’s legacy but prevent it from living on. Just imagine what the market would look like if BlackBerry had opened BBM to the emerging broader market rather than use it to try and protect it’s proprietary services.