The supermajority (perhaps not of the people, but of the supporters of various altcoins) believe that the initial emission period should be rather short, to "get rid" of the pesky "inflation", so that the coin can "start rising in value".
These people have no interest in the long term success of a cryptocurrency platform. The are interested only in making a quick buck. It is a viewpoint entirely fueled by greed. Though this motivation is understandable it is exactly the opposite of what the market will reward. The market cannot reward this any more than we can defy gravity. If it did there would be thousands of tremendously successful altcoins. And where would this value come from?