> The community has tossed out everything we’ve learned from the last 30 years 
  > of building applications in favor of being able to put something together  
  > quickly with complete disregard for maintainability or extendability.

I wonder, heretically, if maintainability/extendability is less important today... in the past, you'd build something, and then need to maintain it for years or decades. But today, if the pace of change really has accelerated that much, perhaps things change so much that it is easier to rebuild from scratch each time (instead of maintaining/extending) - even if you did carefully design it.

Is is just a small but prominent group doing web development (especially with ruby on and back-end and a front-end focus)? Is it just that we're still seeing industries adopt to the web, and old approaches slowly dying (i.e. in the midst of revolutionary times)? Or is this a permenant acceleration, that will only increase?