I am a big fan of tubeless for mountain bikes but would never want to tour on a tubeless set up, unless it was mountain bike touring on singletrack. Very few tubeless systems are able to handle pressures much over 40 psi. There are very few times I would want to run that low of pressure on the road, even 50 psi on 32's is not very high, especially if you have a full touring load on the bike.