I don't expect USB-C, but I could actually see it on the iPad first if it were going to happen. The iPad already needs a special charger (so to speak, if you want it done this century), and is closer to a laptop in function and expectations. They could simply say they're having it join their MacBook line which already uses USB-C. And the iPad is much more likely to host peripherals that could take advantage of USB C (video/audio i/o, network i/o) which can't be done simultaneously using Lightning.
Here's a crazy idea, USB C where Lightning is now, and Lightning where the headphone jack is
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I agree every iPad should have the smart connector, but I don't see why using a bluetooth keyboard isn't just about the same in terms of replacing computers. If you want to do that, they need to add optional mouse pointer support for text and office-type apps while using any keyboard.