I can't see the nano or Armortec line disappearing just yet. The muscle power range has practically vanished into the other rackets. It's only defining feature is used fairly often in the other ranges.
The way I see it is:
Nanospeed: headlight variations in general
Armortec: Head heavy variations in general
Arcsaber: even balance in general
If I was a gambling man I'd say the racket series to go would be the nanospeed rackets, nano something or other is used in the arcsaber line and their head lightness is their only defining feature, something fairly easy to copy into another line. Armortec rackets are still very different with power armour and ultimum ti and unique head shape.
Then again the same could be said of the arcsabers with the x-fullerene component, although they do have the flagship z-slash which is totally different, which I think protects them.
If Yonex got rid of the armortec line it would be like saying, "that didn't quite work out". A bit odd considering the number of players still using them to win major championships.
Also some Yonex rackets still aren't available worldwide such as the Carbonex series or Aerotus lines. These series are also in doubt if Yonex were to globalise its entire racket range, I think they might with Li-Ning able to do exactly that when they wish to go global.
If Yonex switched there marketing slightly to make things easier for the consumer to understand (as in what do these technologies mean to the average player, shaft stiffness, head heavy etc) they might be able to stop Li-Ning walking off with some of there market share. They could use a tagline something like "Simplicity over science". This might stop some of the current disillusionment with racket technologies. I think this is why Dinkalot's panda power and Sgbad's Zelm rackets are proving quite popular, the marketing is simple and geared towards the consumer in a way they understand.
I think Yonex are currently in a high tower away from the people and need "agents in the field" to report back to them on the current feeling from the local clubs and players which make up most of their market. I'm assuming they have people like Paul who do this but most people will be too polite when someone has been invited to their club to criticise the brand their guest is promoting.
Oops not sure how that got so long

.... Sorry if some of it is a little bit off topic
