I'm not sure a focus on the broader consumer market was the problem. I believe the problem was they tried to do a Blackberry copy of an iPhone instead of a Blackberry for the consumer market.

A low priced Blackberry with a nice keyboard for messaging and a decent camera to go along with the horizontal screen would have staked out an area. Making deals with pay-as-you go groups would have gone into an area Apple didn't go and Blackberry might have dominated. Horizontal screen and camera could be an advantage.

They tried to build an iPhone not a Blackberry.