It would not be a good thing for newer innovative coins to continuously replace older coins that were innovative when they were first launched, and then for each new generation to die like the way older computer or mobile phone models do today. The blockchain represents the investments of countless people who believed in the coin's success. Who would invest in a coin with an expected lifetime of a couple of months to a year or two? Unless you plan to transfer all of your assets out of the old gen and into the new gen every time a next gen coin is released. Hence I would think that only coins with a healthy community and a committed dev team (or even multiple dev teams such as in the case with Bitcoin) that implements new features as the market demands them will survive. Such coins will gradually evolve through the generations, from 1st gen to 2nd gen to 3rd gen, and so on.