No, not the same situation at all. Canon has to compete with Nikon, Sony, and the others. The other companies are what give Canon their incentive to innovate.Nonsense! Canon's only incentive (like all the others) is maximising shareholder value. Innovation and product improvement are happy side effects of this. Innovation helps when you are trying to attract new customers (which is why there's such a turnover of models at the bottom end of the market.) It may help to secure brand loyalty when customers go from one lens to (say) four. After that, the customer is locked in and you give them the minimum that will prevent them from walking away in disgust.
The slow turnover at the top end is a result of the manufacturers knowing their market - if users find change between models significant, the captive user may upgrade. If not, they will probably sit on their hands and wait for the next model before reconsidering. This is a difficult field to play in. If a disruptive model comes along - say the A7 series - you may suddenly find a number of high end customers changing brands at very low immediate cost.
But the more system unique equipment a photographer owns, especially if expensive, the less likely they will switch to another system....Yay.... at least one other person gets it!
Of course, the camera manufacturers might not like this freedom. Locking in customers is a good business practice. You don't make money by making it easy for your customers to go elsewhere.