1) Add picture-in-picture support for iPads.
2) Allow background audio when the app isnt open. I use a 3rd party YouTube app to stream music while doing other work. Audio only, radio style commercials could be incorporated.
3) An easy access X / close button could appear once a video finishes or in the final seconds.
4) Improve the home menu, make it customizable, add a spotlight / "suggested channel for you" feature.
5) Shorter ads for music playlists - Im less likely have device in arms reach to skip the ads.
Blue. Flames about YouTube - Watch, Upload and Share Videos, v11.15