No, updating an unsupported iPad has never been possible, and even if it were, you wouldn’t want to. Performance and battery life would be so poor so as to render the device unusable, and 1GB of RAM is so little for the current OS that I doubt it could run it, anyway.
Updates do enough harm as they are, if Apple were to extend support even further it would be a fiasco, like it was back with the iPhone 4 and 4s, and the iPhone 5 and 5c.