You are quite right, the current pump and dump groups, ICO rallies and all that shit are geared more towards the opportunistic profiteers looking for quick short term high yield.
What the altcoin market needs to increase its trustworthiness and as a consequence, its market cap, it real world market adoption.
For example, if vendors started accepting Dash, then dash would integrate more permanently into the real-world environment. Since it would then have a true use and true value, it should attract more and more trust and market cap as more and more people adopt it to actually use it, rather than just pump it and dump it.
This really then relies on a coin that has the capability of being used in real world markets. Bitcoin has long block times, too long for quick in-store transactions for example. Each coin, with its slightly different features makes it an evolution of bitcoin in essence. So when a coin is built with suitable characteristics for real world use, it should then grow in adoption.
The crypto scene needs a more direct and established link to real world products and services. Only then will a/those coin(s) become firmly rooted and have price stability akin to fiat currency.