It bothers me to see all the Canons and not Nikons at the octagon!

The best way to attract pros is to continue making good equipment, so they're doing their part. OP mentioned more "aggressive marketing" but pro's don't tend to look at marketing as much as amateurs unless you're talking about paying the pros directly or giving them free equipment.  Canon used to have a pretty significant edge especially when it comes to sports photogs and generally people don't switch systems unless there's a significant advantage, which right now I'd say there isn't much of one for either camp.