I am no expert in the field (I'm no scientist) and I dont know a lot of the small details. However I do understand a lot of the basics.
In my opinion, xMAP (and luminex's other system, xTAG), are superiour, at least in potential, to dragonfly system for the purpose of use in clinical setting. As far as I can tell, and based on many publications, xMAP is not a dead end at all.
Like I said, this is all based on my non-expert understanding of all of this. This also doesnt mean that whatever technology dragonfly uses will be useless unless some other technology completely eclipses it in every aspect. And xMAP doesnt seem to be the be-all-end-all type of thing to do that. It simply fills the role of intermediate density testing very well as far as i can tell