RE: The Problem with Archery?!
I'll try to answer your question. Guns have improved over the last 100 years, but the old ones still work well. Least I say better production of ammunition, improved sighting systems, muzzle breaks, light-weight stocks, etc.
Likewise, bows have improved. The difference, however, is the the demand for archery, while stagnant for the first 3/4 of this century, is increasing every year. The access to hunting around heavily populated areas, in part, has prompted the demand. The desire to improve the 'bow', especially prior to 1990, was impaired by the demand. The demand has produced the need to grasp the latest technology and materials available to give the consumers something more attractive. Since there is so much available in the two categories mentioned, releasing it over a period of time is beneficial to the manufacturers.
There are many new designs in progress right now that may or may not be introduced next year. It's the way most industries operate. My two year old truck does not have all the nice features of the current model. My computer was outdated when I bought it. My two year old television is now much cheaper and new technology makes it look 'old'.
I think you get the point.