Drupal suffers from this same problem. Every time a new major version comes out, all of the existing modules break and have to be rewritten. With over 4000 modu

Drupal suffers from this same problem. Every time a new major version comes out, all of the existing modules break and have to be rewritten. With over 4000 modules (and roughly the same number of module authors), it's a serious problem. What ends up happening is everyone keeps using the old version of Drupal until they're forced to upgrade or abandon it due to security concerns (old versions don't get patches from the security team).