All the things that you just mentioned ate just speculative things which cannot sustain for longer periods whereas when an altcoins got real reasons for adopting it then it will gain its value regardless of how much supply it will be having or where it will be listed. But, like you mentioned only speculative things are playing major role on most of coin's valuation which shows that only bumping and dumping kind of manipulations are the real deciding factors for most altcoins.

I guess when an altcoin gains its value due to external factors which are not directly linked to the ecosystem of that altcoin then I believe that coins will eventually will reach the value of zero one day or another.