Thanks for the kind comments on WP, folks who made them.
In terms of Node, at Automattic we also think it's the bee's knees and have a number of projects that are built in it. But it's pretty weak for distribution, PHP/MySQL is still tops.
I think to the extent WP has been successful over the past 11 years it's because we've always been gradually rewriting and refactoring things, and have listened to our users and been driven by a community rather than just a company. We have a vision (democratize publishing) for more than just money, and it drives efforts from education to localization.