I suspect the likes of Tern and Dahon have nowhere else to go but upmarket lest they be devoured by the much less expensive gear coming out China in the last decade. A big reason is the easy availability of quality, affordable framesets and parts coming form the likes of FnHon and Litepro, among several others.

I've said this before and I'll say it again at the risk of perturbing the Dahon devotees here. Buying a Dahon today, unless it is the more unique models like the Curl, Vybe, etc., doesn't make sense because for less money you can buy essentially the same bike from other brands or...or... here's the kick in the chin...you can build or have built a better specced bike based on an FnHon or Litepro frame for the same and perhaps even less money. That applies too to the crowd favorite the Dahon K3/K3+.