It should be apparent now that new technology drives advances of older technology. Storage companies have a lot to lose if their technology is eclipsed by newer technology, so they continue to fiercely market and invest in extending the older technology. Survival is a driving force for a company and for individuals that have invested their careers in aligning with a technology.
The competition, if you can call it that, between a new technology and the previous generational technology is interesting to watch if you are not invested in one or the other. The older technology must be advanced to stay relevant. In the storage industry, this competition usually means increased capacity at a lower cost with better performance.