Running tubeless is actually a great idea for touring. You get nearly flat-proof protection without the added weight of tire liners, thick tubes, or extra beefy tires. If you do get a flat, you can install a tube just like normal. The only drawbacks would be that on extended tours (over 6 months), you'd probably have to stop by a bike shop to add more sealant, as it dries out over time, and that you have to top off your tires more often because the tire casing loses air faster than a butyl tube.
Since the industry seems to be pushing more mountain bike tech (disc brakes, 1x setups, tubeless, wide tires), I bet we'll see a lot more tourists running tubeless in the near future.