Kodi is actually one of the main things I want out of Switch homebrew, so this is awesome news, and sound support seems to be on the horizon too. Can't be bothered to carry a tablet around with me when my phone does all the same things, but the Switch I'm often carrying with me anyway, and being able to play videos on a larger screen would be great for when I'm not at home for a few days.
I am going to wait a bit longer though until the battery issues with Linux are sorted out. Don't want to mess up my Switch.
I wonder if we could extend the battery life further though. 3-3.5 hours (what you will normally get playing Switch games) really isn't much for video playback, especially not on a long plane trip. If we could double that by underclocking the CPU (GPU is already pretty heavily underclocked) that would be a much more reasonable battery life for video watching. It shouldn't affect video playback since that's hardware accelerated, so we should be able to get away with a pretty heavy underclock just for Kodi. For comparison the original single-core 600Mhz Raspberry Pi played 1080p in Kodi just fine thanks to hardware decoding, the X1 should have even better hardware deciding abilities seeing as it was made for Android originally. UI was a bit sluggish, but completely usable, and with more cores that should be a non issue.
I believe it should be possible, since tablets and phones normally get a pretty decent battery life when playing videos, much longer than when playing games.