I have a 1977 Fuji S10-S that I love and it rides like a dream. I also have a Fuji Touring Series IV. I haven't had a chance to take it on a long ride yet but it seems to be pretty nice. Since riders have such a wide preference and everyone is physically different I think that a lot of what makes for a good touring frame is how well the frame fits the rider.

Some riders prefer a trailer over bags or to use a combination of the two. Some riders are smaller/lighter and so they don't need the mechanical advantage of cantilever brakes.

If you find a frame that fits you well and gives you the right riding position, it is very possible to turn it into a decent touring bike.