Using the GPL is more than just a matter of pleasing "Matt and the majority of the WordPress community" though. It's part of the licensing agreement you accept when you develop products using the code and functions in WordPress. If you distribute such a product it has to be GPLed.

Sorry to nitpick, but it's an obligation and responsibility on everyone who participates in a GPL project.

I'm not even sure if it's ok to dual license a product either because the GPL demands that any redistribution of affected code be GPLed. The only way to dual licence is when you own the copyright to the entire project (in this case WordPress itself). Then you can do what you like.