This whole discussion seems to be off on picking apart the idea of using folding bikes to tour. Both rational and irrational reasons are presented, but the only ones that have merit were the cost and possible fit issues. I note also that the naysayers are mostly people who haven't really given one a good try. I may be misjudging, but that's the tone I heard.The thread seemed to me to generally be supportive of the notion of folders for touring. My post probably had some of the most negative comments, but did not "pick apart the idea of idea of using folding bikes to tour". I did pick at the particular style of bike that the first post of the thread was about. It seemed a poor choice for touring to me for the reasons I listed.
The Bike Friday does look like for some folks in some touring conditions that it would make a lot of sense. Like any bike style there are some compromises with even the best of the folders. For most of my tours the benefits would not be that great so I see no reason the deal with the compromises which include the cost among other things. If your touring style would benefit greatly from a folder then a BF might be the ticket, but I have my doubts about the Tern Eclipse S-18. It looks a lot like a dolled up Dahon, with a lot of the same disadvantages and hefty price tag. The Tern in question seems like more of a mixed mode commuter that a touring bike.