What do you expect? All their aeg's bar the recoil shocks and high cycles are over 5 years old now... Event he m14 (one of their last standard aeg's) was released in something like 2005.
The original ar-15's and g36's are now over ten years old.
Airsoft's technology is moving faster than ever these days, and if you can't keep up you lose out, so I can only assume that TM don't plan on selling many of the old versions these days- otherwise they'd do something about it.