Killing their own good ideas is what Apple does best.
Magsafe. Firewire. Cheese grater Mac Pro. Appletalk. Rosetta. Pre-2015 MBP. Original iMovie and iWork apps. The list goes on.
I'm pretty sure they didn't remove firewire from the MacBook line until the Retina came out, which had USB 3 and Thunderbolt. Both of which are faster than Firewire.