It would cost me $3000 to replace it with a computer that is not significantly more powerful, has a smaller screen and less I/O functionality, and would be incompatible with my audio interface unless I daisy-chain multiple adapters to get Firewire. Fuck that, as long as possible.
This week, my mother's crappy Windows computer died, and I bought her a Chromebook. It was great! I'm now seriously considering getting a Chromebook for myself for day-to-day web browsing and such, and retiring the MBP to music and photos only. If I can figure out how to run Vagrant on one, I'll probably switch for development, too (or maybe I'll just start paying for a cloud-based dev environment).
Meanwhile, I keep having computer envy for a friend's MS Surface Pro. It's the first time I've ever looked longingly from a MacBook to a Windows machine! But frankly, it does things my Mac doesn't do, and the build quality is on par.
Someone please tell Apple than when you need to hold a press conference to convince people you're committed to your product, you're not committed to your product.