Really? Did they seriously run out of ideas? This is probably the most generic and uninspired Mario I've ever seen. The graphics do look good though.
I don't see how you came to that conclusion. If anything, it looks like it's going to introduce some newer concepts to the 3D Mario games.
Also, I wouldn't be surprised if they did run out of ideas; I definitely would have been drained if I've been thinking of new ideas for the past 26 years.