You could tell them one of two things....
1. When your Block has been around 100 years, you'll consider owning one.
2. John Browning didn't design your pistol, so no thanks.
Not sure what you're getting at as far as replacing the hammer......you mean to get rid of the safety system? I'm not sure why that bothers you, just don't use it. I'd suspect, though, that if you try to get rid of it, you'll run into issues with repairing it if that day ever came......you might void the warranty.