Translation: Apple has lost their innovative spark, so they opened the platform to others hoping they'll write interesting and useful things for them.
Not sure I'd go that far. This is following pretty close on the heels of iOS 7 which was a pretty big change. The longer a successful system is in place, the less likely a huge transformational leap is going to come along. And when it does, most people will ***** and moan about it! (see Windows Metro)