I don't see why they would care that they are destroying sales of the intel MBP 13. Let consumers buy what they want - the M1 chip is likely far higher profit margins than the intel variant, and encouraging consumers to the Apple chip model is definitely a profit driver.

Some people especially developers may be skeptical of leaving x86 at this stage. I think the smart ones would just delay a laptop purchase until ARM is proven with docker and other developer workflows.

Another consideration - companies buying Apple machines will likely stay on Intel for a longer time, as supporting both Intel and ARM from an enterprise IT perspective just sounds like a PITA.