Xbox On Mobile Devices

Personally I don't think we will see something like that, probably the closest thing will be a game streaming device. but only time will tell.

We can only hope! I think MS sees the writing on the wall much better than Sony does when it comes to this, so it wouldnt surprise me if we see some sort of XBox handheld at some point, especially with the idea that the XBox brand is a family of consoles
you can play anywhere. So you have a 4k X at home and a 1080p S Portable on the go 😀

I feel like Microsoft will always prioritize the most power possible when making their consoles. That being said, making a console woth 'on the go' functionality may detract from that.

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I don't see why they should and honestly I hope they don't. Nintendo has a long time experience with portable devices and a peculiar game line up, it has always been something different on the market.

Also with big names like Bethesda going mobile on android and IOS with dedicated games, I'd say MS should focus on something else.