Professional cameras are expensive. Even amateur photographers will have many thousands, even tens of thousands tied up in their equipment. These people are not going to buy one of your new "pro" laptops Apple, because you've taken away the ability to either plug the (camera end) proprietary USB cable into it or the the SD card. Your solution, which is to hope that we all upgrade our camera bodies to something more convenient to you, or buy a dongle from you so we can use our cables is not going to cut it.
The counter argument to this is that people who already have thousands invested in their expensive equipment won't mind spending a few more dollars for the adapters if they want to stay in the apple ecosystem. Because you can charge people who are already spending a lot of money to spend a little more. Apple knows its target audience REALLY well. The solution to buy a dongle is definitely going to cut it for a lot of the people.
If you're not part of the solution, you're part of the precipitate.