I don't have experience with Drupal, but it says "plan for periodic upgrades of their project to the latest major release (every 6 years or so)". So, even if a

I don't have experience with Drupal, but it says "plan for periodic upgrades of their project to the latest major release (every 6 years or so)". So, even if a new release comes out, you have _literally several years_ to decide when to make a switch. For perspective, Backbone.js was released 5 years ago!